Britney Spears does the splits in teeny workout ensemble: 'Back at the gym!'

Oops ... she's doing it again!

Britney Spears took to Instagram on Sunday night to show off her incredibly fit physique as she put in the work (b-tch!) at the gym. Wearing a bright pink zip-front sports bra and teeny gray gym shorts, Spears looked absolutely incredible as she takes a couple of mirror selfies ... including one of herself doing the splits!

SEE ALSO: Radio Disney Music Awards 2017: Red carpet arrivals

"Back at the gym," she captioned the Instagram slideshow. "Stretch and run all the way."

67 PHOTOS
Britney Spears' sexiest Instagrams of 2017
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Britney Spears' sexiest Instagrams of 2017
🌺🍎🌺🍎
We’re getting creative at our house lately... 🌺🌸🌷🌸🌺🌸🌷
Donny always makes me smile and happy πŸ’—πŸŽπŸ’— #PieceOfMe
So in love with this puppy 🐢@samasghari πŸŽƒπŸŽƒπŸ‘»πŸŽƒπŸŽƒ #HappyHalloween
LOVE IS BLIND.
πŸ‘―πŸŽπŸ‘―
We’ll get through this together ❀️ See you Wednesday #VegasStrong
πŸ‘ πŸ‘ πŸ‘ πŸ‘ πŸ‘ πŸ’„πŸ’„πŸ’„πŸ’„πŸ’„πŸ’„
πŸ‘™πŸ‘ πŸ‘—πŸ‘―πŸ’ƒπŸΌπŸ’…πŸ»πŸ‘…
You never know who you’re going to meet at dinner parties!! πŸŽ‰ Great night! So much fun, thank you Cade! πŸƒπŸƒ
Who says you can’t do fashion week at home! 😜 πŸ‘ πŸ‘—
πŸ‘’πŸ‘’πŸ‘—πŸ‘—πŸ‘›πŸ‘›πŸŒ‚πŸŒ‚πŸ£πŸ£
πŸ¦„πŸ¦„πŸ¦‹πŸ¦‹πŸ­πŸ­πŸ―πŸ―πŸ°πŸ°
πŸ πŸ πŸ’πŸ’πŸŒΈπŸŒΈπŸ₯€πŸ₯€πŸŒˆπŸŒˆ
β˜€οΈβ˜€οΈβ˜€οΈ @disneyland
When this song came out, I lost my mind like a little kid!!! I fangirled and cried!! πŸ˜‰πŸ˜‰πŸ˜œπŸŽ€πŸ‘›πŸŒΈ
🌸🌸🌸 @britneyspearsfragrances πŸ“·: @randeestnicholas
On days where I don’t get primped and made up for my show, this is the real unglammed me… so nice to meet all of you!! πŸ˜‚ I call this my morning coffee at home look β˜•οΈ #NoMakeupMonday if you don’t count the leftover mascara under my right eye... πŸ˜‚πŸ˜œ
Staying focusedπŸ‘™πŸ¦‹πŸŒΊπŸŽ€
Beautiful day for an outdoor workout!!! πŸŽ€
My favorite dress πŸŽ€πŸ’œπŸ‘ πŸ‘ πŸ‘ β€οΈ
I'm a girl boss, baby πŸ˜‰πŸ˜‰πŸ˜‰πŸ˜‰
#flashbackfriday ❀️
Had a couple of weeks off… ha!! Well, not really… been keeping my body strong and motivating myself everyday!! There’s nothing like mommy and workout time, the beautiful outdoors, and flipping into gearΒ πŸ¦‹πŸŽ€πŸ˜‰πŸ˜‰πŸ˜‰πŸ˜‰
🌟@britneyspearsfragrances
πŸ‘ πŸ‘ πŸ‘ πŸ‘  @britneyspearsfragrances
Tel Aviv here I come!! Can't wait to take the stage at Park Hayarkon on July 3rd! Hey @guypines, see you there!!
πŸ¦‹πŸ¦‹
Throwback to Japan!!!!! Absolutely loving everything about this tour! So incredible!! Can't wait for Bangkok ✨
Excited for a great show here tonight in Osaka πŸ¦‹πŸŒΊπŸ¦‹
Great workout this morning! Woke up in Japan feeling free and grateful. Better work bitches!
Getting ready to leave for tour! See you soon Japan πŸ‡―πŸ‡΅
What's your favorite color? πŸ€”πŸ€”πŸ€”πŸ¦‹
❀️
❀️
😜😜😜
Friday night fun... thanks for the little black dress @pninatornai πŸ’–
#tbt πŸŽ€πŸŽ€πŸŽ€
🌸🌺🌸
πŸ’™πŸŒΉ
Great run in Vegas! Be back Next week!
Happy #RDMA Day 🌺🌺
Back at the gym.... stretch and run all the way πŸ’•πŸ‘™πŸ’•πŸ’•πŸŒΊπŸŒΈπŸŽ€
Isn't spring great πŸ˜‰πŸ˜‰πŸ˜‰πŸ˜‰
My special message to the amazing women who were celebrated at #MusicRowMagazine #RisingWomen breakfast today πŸ’œ #girlpower
I love my backyard πŸƒNo sneaky paps here!! πŸ˜‰
Missing the water already... #tbt
🌹
Another great day 🌺🌺
What's better than sweats and a tshirt? 😊
Training keeps me motivated and inspired... but I'd rather be dancing πŸ˜‰πŸ’ƒ
Last show of the week with @samasghari 🏡🏡🏡
Option 1 or option 2? πŸ‘— #ootd
TGIF β˜€οΈ
Just another humble workout post 😜😜😜
Another day, another runway πŸ‘ πŸ‘ πŸ‘ 
Just doing my own runway show 🌺🌺🌺
Staying motivated πŸ’ͺ
Blessed day πŸ’œπŸ’œπŸ’œ
Owning my temple, my body, through yoga πŸ’•πŸŽ‰ but I really need to find one of those cool round mats!!
Thank you again for the beautiful dress @uelcamiloofficial @doraziopr #tbt #pregrammygala
Before hair and makeup πŸ’„πŸ’‹Β #PreGlam #PreGrammyGala #Latergram
Family time β˜€οΈ
🐯🐯🐯 photo by @denisetruscello
🐯
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The sultry selfies show off Britney's six-pack abs, toned arms and extreme flexibility, which are things that she has put on display on Instagram before. The singer has gotten into increasingly good shape as she continues her Las Vegas residency Piece of Me, which will end later this year in December.

Spears posted the selfies just one day after stepping out for the 2017 Radio Disney Music Awards with her two songs and sister, Jamie Lynn. She was honored with the Icon Award at the fun-filled ceremony, and she looked absolutely incredible in a skintight black dress with one major cutout.

Check out Britney Spears -- and more stars -- at the Radio Disney Music Awards:

66 PHOTOS
Radio Disney Music Awards: Red carpet arrivals
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Radio Disney Music Awards: Red carpet arrivals
DISNEY CHANNEL PRESENTS THE 2017 RADIO DISNEY MUSIC AWARDS - Entertainment's brightest young stars turned out for the 2017 Radio Disney Music Awards (RDMA), music's biggest event for families, at Microsoft Theater in Los Angeles on Saturday, April 29. 'Disney Channel Presents the 2017 Radio Disney Music Awards' airs Sunday, April 30 (7:00 p.m. EDT). (Image Group LA/Disney Channel via Getty Images) BRITNEY SPEARS
DISNEY CHANNEL PRESENTS THE 2017 RADIO DISNEY MUSIC AWARDS - Entertainment's brightest young stars turned out for the 2017 Radio Disney Music Awards (RDMA), music's biggest event for families, at Microsoft Theater in Los Angeles on Saturday, April 29. 'Disney Channel Presents the 2017 Radio Disney Music Awards' airs Sunday, April 30 (7:00 p.m. EDT). (Image Group LA/Disney Channel via Getty Images) BRITNEY SPEARS, JAMIE LYNN SPEARS
LOS ANGELES, CA - APRIL 29: Nick Jonas attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Singer Kelsea Ballerini attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Hailee Steinfeld attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Singer Camila Cabello attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Noah Cyrus attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Raven-Symone attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Actress Janel Parrish attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Singer Alessia Cara attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Grace VanderWaal attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
Laurie Hernandez attends the Radio Disney Music Awards (RDMAs) at the Microsoft Theater, in Los Angeles, California, on April 29, 2017. / AFP PHOTO / TIBRINA HOBSON (Photo credit should read TIBRINA HOBSON/AFP/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Natasha Bedingfield attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actor Diedrich Bader (L) and Ondine Bader attend the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
Aubrey Anderson-Emmons attends the Radio Disney Music Awards (RDMAs) at the Microsoft Theater, in Los Angeles, California, on April 29, 2017. / AFP PHOTO / TIBRINA HOBSON (Photo credit should read TIBRINA HOBSON/AFP/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Nick Jonas (C) attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Sabrina Carpenter attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Actress Dove Cameron attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
DISNEY CHANNEL PRESENTS THE 2017 RADIO DISNEY MUSIC AWARDS - Entertainment's brightest young stars turned out for the 2017 Radio Disney Music Awards (RDMA), music's biggest event for families, at Microsoft Theater in Los Angeles on Saturday, April 29. 'Disney Channel Presents the 2017 Radio Disney Music Awards' airs Sunday, April 30 (7:00 p.m. EDT). (Image Group LA/Disney Channel via Getty Images) BRITNEY SPEARS, JAMIE LYNN SPEARS
LOS ANGELES, CA - APRIL 29: Actress Alyson Stoner attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Actress Skai Jackson attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Singer Patrick Monahan (L) and Amber Peterson attend the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Mackenzie Hancsicsak attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Violinst Lindsey Stirling attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
Miles Brown attends the Radio Disney Music Awards (RDMAs) at the Microsoft Theater, in Los Angeles, California, on April 29, 2017. / AFP PHOTO / TIBRINA HOBSON (Photo credit should read TIBRINA HOBSON/AFP/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Auli'i Cravalho attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Sophie Reynolds attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
Marsai Martin attends the Radio Disney Music Awards (RDMAs) at the Microsoft Theater, in Los Angeles, California, on April 29, 2017. / AFP PHOTO / TIBRINA HOBSON (Photo credit should read TIBRINA HOBSON/AFP/Getty Images)
LOS ANGELES, CA - APRIL 29: Eva Gutowski attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Trinitee Stokes attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Hayley Orrantia attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Sarah Gilman attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Landry Bender attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Lauren Taylor attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Sofia Reyes attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Madison Hu attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Jenna Ortega attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Bea Miller attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Sofia Carson attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Lilimar Hernandez attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Forever In Your Mind attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Fitz & The Tantrums attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Tammy Townsend attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Sarah Darling attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Sammi Sanchez attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Miranda May attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Montana Tucker attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Genevieve Goings attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Lacy Cavalier attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Actress Rosanna Pansino attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - APRIL 29: Singer Kelsea Ballerini attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Lele Pons and Hannah Stocking attend the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Producer Kenny Ortega attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Alana Springsteen attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Singer Megan Nicole attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Singer Julia Michaels attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Sonika Vaid attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Skylar Stecker attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Cerina Vincent attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Tally attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Barry White, Jr. attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Singer Symon attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - APRIL 29: Actress China Anne McClain attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
Actor Jet Jurgensmeyer attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California.
Actor Nathan Arenas attends the 2017 Radio Disney Music Awards at Microsoft Theater on April 29, 2017 in Los Angeles, California.
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