Melissa Joan Hart flaunts 40-lb. weight loss on her 40th birthday

Melissa Joan Hart Shows Off Bikini Body

Talk about a bewitching bikini bod!

Melissa Joan Hart recently slimmed down thanks to Nutrisystem, and she has no qualms about flaunting her new, fit bod. The actress just celebrated her 40th birthday in Punta Cana with girlfriends and rocked sexy bikini after sexy bikini on her tropical getaway.

One of her most sizzling snaps shows the star posing confidently poolside in an eye-catching green Eres bikini with a dainty Lera Jewels lariat chain drawing attention to her cleavage.

The actress also shared snaps of ziplining adventures, moonlight drinks on the beach with friends and cannonballs in the pool ... Looks like a fun time!

Hart hasn't aged a day! See more photos of the actress through the years:

33 PHOTOS
Melissa Joan Hart through the years
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Melissa Joan Hart flaunts 40-lb. weight loss on her 40th birthday
NEW YORK - 1994: Actress Melissa Joan Hart poses for a portrait in 1994 in New York City, New York. (Photo by Michael Ochs Archives/Getty Images)
Actress Melissa Joan Hart. (Photo by Time Life Pictures/DMI/The LIFE Picture Collection/Getty Images)
Actress Melissa Joan Hart in Press Room at NICKELODEON's Kid's Choice Awards. (Photo by Mirek Towski/DMI/The LIFE Picture Collection/Getty Images)
Melissa Joan Hart during 1994 Cable Ace Awards in Los Angeles, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
CANADA - APRIL 07: SABRINA, THE TEENAGE WITCH (MOVIE) - 4/7/96, Melissa Joan Hart (as Sabrina) stars in this original cable television motion picture that inspired the popular ABC-TV series of the same name., (SHOWTIME), MELISSA JOAN HART (Photo by Showtime/ABC via Getty Images)
UNITED STATES - OCTOBER 16: SABRINA, THE TEENAGE WITCH - 'The Pom Pom Incident' - Season Three - 10/16/98, Dom DeLuise guest starred as Cousin Mortimer. Melissa Joan Hart (Sabrina) also stars., (Photo by Randy Holmes/ABC via Getty Images)
Melissa Joan Hart during 1994 Kid's Choice Awards in Los Angeles, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
CANADA - APRIL 07: SABRINA, THE TEENAGE WITCH (MOVIE) - 4/7/96, Melissa Joan Hart (as Sabrina) stars in this original cable television motion picture that inspired the popular ABC-TV series of the same name., (SHOWTIME), MELISSA JOAN HART (Photo by Showtime/ABC via Getty Images)
UNITED STATES - FEBRUARY 14: SABRINA, THE TEENAGE WITCH - 'First Kiss' - Season One - 2/14/97, Sabrina (Melissa Joan Hart) ignored Salem's warning that her kiss would turn Harvey into a frog., (Photo by ABC Photo Archives/ABC via Getty Images)
THE TONIGHT SHOW WITH JAY LENO -- Episode 1116 -- Pictured: (l-r) Actress Melissa Joan Hart during an interview with host Jay Leno on March 31, 1997 -- (Photo by: Margaret Norton/NBC/NBCU Photo Bank via Getty Images)
UNITED STATES - AUGUST 15: SABRINA, THE TEENAGE WITCH - gallery - Season Four - 8/15/99, Beth Broderick, Melissa Joan Hart, Caroline Rhea, (Photo by Bob D'Amico/ABC via Getty Images)
Melissa Joan Hart during The 29th Annual American Music Awards - Arrivals at The Shrine Auditorium in Los Angeles, California, United States. (Photo by Ron Galella/WireImage)
Melissa Joan Hart (amerikanischer Fernseh-Star 'Sabrina'), ZDF-Gala zum '3.Laureus World Sports Award', Monte Carlo/Monaco, 'Grimaldi-Forum', Ankunft, (Photo by Peter Bischoff/Getty Images)
UNITED STATES - SEPTEMBER 19: Melissa Joan Hart attending the premiere of 'The Tuxedo' in Hollywood 09/19/02 (Photo by Vinnie Zuffante/Getty Images)
Melissa Joan Hart during 'Win A Date With Tad Hamilton!' World Premiere at Pacific Crest Theatre in Westwood, California, United States. (Photo by Jon Kopaloff/FilmMagic)
Melissa Joan Hart during 'Wimbledon' World Premiere - Arrivals at Academy of Motion Picture Arts and Science in Beverly Hills, California, United States. (Photo by Jon Kopaloff/FilmMagic)
Melissa Joan Hart at the The Renberg Theater in Los Angeles, California (Photo by Jesse Grant/WireImage)
Mark Wilkerson, Mason Wilkerson and Melissa Joan Hart (Photo by E. Charbonneau/WireImage for Disney Pictures)
Melissa Joan Hart and son Mason during The Second Annual VH1 Big Shopping To Benefit The VH1 Save The Music Foundation in West Hollywood, California, United States. ***Exclusive*** (Photo by Michael Tran/FilmMagic for VH1 - Off Air Creative)
STUDIO CITY, CA - MAY 28: (L-R) Mason Walter Wilkerson, Melissa Joan Hart and Braydon Hart Wilkerson attend the Playroom's first anniversary benefiting Friends of the Family hosted by Melissa Joan Hart on May 28, 2008 at the Playroom in Studio City, California. (Photo by John M. Heller/Getty Images)
HOLLYWOOD - OCTOBER 07: Actress Melissa Joan Hart attends Auto Club Speedway's Pepsi 500 at The Roosevelt Hotel on October 7, 2009 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
DANCING WITH THE STARS - 'Episode 902' - It was a night of Quickstep, Jive and Tango, as 'Dancing with the Stars' welcomed Baz Luhrmann to the ballroom as a guest judge during Week 2 of the competition, MONDAY, SEPTEMBER 28 (8:00-10:02 p.m., ET). (Adam Larkey/ABC via Getty Images) MELISSA JOAN HART, MARK BALLAS
DANCING WITH THE STARS THE RESULTS SHOW - 'Episode 906A' - After a night of Waltz, Jitterbug and the first competition Mambo group routine, the remaining nine couples faced their first Dance-Off double elimination as the eighth and ninth couples eliminated from the competition - Melissa Joan Hart and Mark Ballas, and Louie Vito and Chelsea Hightower - were announced, on 'Dancing with the Stars the Results Show,' TUESDAY, OCTOBER 27 (9:00-10:01 p.m., ET), on the ABC Television Network. (Photo by Adam Larkey/ABC via Getty Images) TOM BERGERON, MELISSA JOAN HART, MARK BALLAS
UNITED STATES - AUGUST 25: DANCING WITH THE STARS - MELISSA JOAN HART & MARK BALLAS -- Known for her starring roles in the television series 'Clarissa Explains It All' and 'Sabrina the Teenage Witch,' Melissa Joan Hart began her career at the early age of four with television commercials and various television appearances. She starred in the film 'Drive Me Crazy' alongside 'Entourage's' Adrian Grenier, as well as the ABC Family Original Movie 'Holiday in Handcuffs,' opposite 'Dancing with the Stars' alumnus Mario Lopez, which was the highest rated program in the history of the network. In 2009 Hart starred in another ABC Family Original Movie, 'My Fake FiancΓ―ΒΏΒ½ that also garnered huge ratings. In 1993 she started her own production company, Hartbreak Films, and is set to release her first thriller film, 'Nine Dead,' to DVD in January 2010. Hart and husband Mark Wilkerson are the proud parents of two sons, Mason, age three, and Braydon, 17 months. She teams up with reigning two-time 'Dancing with the Stars' champ MARK BALLAS, who returns for his fifth season. An all new cast of celebrities hits the dance floor on ABC's 'Dancing with the Stars' with the highly anticipated two-hour season premiere, MONDAY, SEPTEMBER 21, 2009 (8:00-10:00 p.m., ET) on ABC. (Photo by Harper Smith/ABC via Getty Images)
(EXCLUSIVE ACCESS-Premium Rates Apply)DANCING WITH THE STARS - 'Episode 905' - It was a night of Paso Doble and Argentine Tango, and a group Hustle with all ten couples, on 'Dancing with the Stars,' MONDAY, OCTOBER 19 (8:00-10:02 p.m., ET), on the ABC Television Network. (Adam Larkey/ABC via Getty Images) MELISSA JOAN HART, MARK BALLAS
DANCING WITH THE STARS - 'Episode 903' - It was a night of Samba and Rumba on 'Dancing with the Stars,' MONDAY, OCTOBER 5 (8:00-10:02 p.m., ET), on the ABC Television Network. (Photo by Adam Larkey/ABC via Getty Images) MARK BALLAS, MELISSA JOAN HART
LOS ANGELES, CA - NOVEMBER 18: Actress Melissa Joan Hart arrives at the Us Weekly Hot Hollywood Event at Voyeur on November 18, 2009 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
TODAY -- Pictured: (L-r) Hoda Kotb, Kathie Lee Gifford and Melissa Joan Hart appear on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
MELISSA & JOEY - 'Enemies with Benefits' - Joe's ex wife wants to get back together and Lennox wants to be popular, on 'Melissa & Joey' airing on WEDNESDAY, JUNE 29 (8:00-8:30 p.m., ET), on ABC Family. Photo by Craig Sjodin/ABC Family via Getty ImagesMELISSA JOAN HART, MEGAN HILTY
MONACO - JUNE 08: Melissa Joan Hart attends Photocall for 'Melissa & Joey' during the 51st Monte Carlo TV Festival on June 8, 2011 in Monaco, Monaco. (Photo by Tony Barson/WireImage)
NEW YORK, NY - OCTOBER 19: Melissa Joan Hart visits at SiriusXM Studios on October 19, 2017 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK, NY - OCTOBER 18: Melissa Joan Hart discusses 'The Watcher in the Woods' with the Build Series at Build Studio on October 18, 2017 in New York City. (Photo by Roy Rochlin/FilmMagic)
NEW YORK, NY - FEBRUARY 08: Melissa Joan Hart attends the Red Dress / Go Red For Women Fashion Show at Hammerstein Ballroom on February 8, 2018 in New York City. (Photo by Gary Gershoff/WireImage)
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The former "Sabrina the Teenage Witch" star, who has three children, recently opened up about being about her weight loss and being a "happy, healthy and active" part of her family.

"As a wife and mom, I am constantly trying to be the best version of myself. I want be a good example for my children. I want to be healthy for them and I want to show them how to be healthy."

Check out Nutrisystem's products on their site and Amazon.

See Hollywood's hottest bikini bods:

99 PHOTOS
Spring Break 2016 - Stars in Bikinis
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Melissa Joan Hart flaunts 40-lb. weight loss on her 40th birthday
My number one ho
TheWifeOfPablo
Happy Saturday. πŸ˜ŽπŸŒ΄πŸ™πŸ» #familytime πŸ’œ@davidbeckham @brooklynbeckham X VB
Adios Mexico πŸ’šβšͺ️❀️
Not in Greece but...
J U N E 1 ✨
Love this @gmilanesi airstream she did for @casamigos in honor of the bohemian artist Amos Ferguson #tacoheaven
Traveling the world is one of the most beautiful things in life. Thank you Brazil for having me and my family, and big thanks to @Airbnb for putting us upπŸ˜˜πŸ˜˜πŸ˜˜πŸ‡§πŸ‡·
"In the summertime when the weather was hot🌞 You can stretch right up and touch the sky🏝 When the weathers fine...." #summer #ready4myvacation
Watching over the bay at the fairmont beach in Barbados
See the light in others and treat them as if that is all you see. -Wayne Dyer #letThereBeLight
They turning up! πŸ‘€πŸ‘€πŸ‘€βœŠπŸΏπŸ˜­
Long Weekend ahead got me like... @constancejablonski 😎 Fin de Semana Largo me tiene...
Camouflaging πŸŒΏπŸƒ worked?
we love our little Gus Gus & we love our @kortnijeane high waisted bottoms πŸ˜»β˜€οΈ 5.26.16
Mixing and matching my favorite pieces from the 5x5 Swim Project with @lspaceswim πŸ’™ Shop this and more on @REVOLVE (available now) #REVOLVE5x5 #REVOLVEaroundtheworld Link in bio!
πŸ’™
Happy sunny day!! Are you guys ready for #aintyourmama video!!??
Lunch break
Bought three new swimsuits today πŸ‘™ This one is my favorite!
So #blessed to be on the #lake with my #family and to have a day off of work! #sisters #saltandpepper @scherzygirl
Χ’Χ›Χ©Χ™Χ• Χ‘Χ—Χ Χ•Χ™Χ•Χͺ πŸ‘™β˜€οΈ Χ§Χ•ΧœΧ§Χ¦Χ™Χ™Χͺ Χ‘Χ’Χ“Χ™ ים Χ‘Χ’Χ™Χ¦Χ•Χ‘Χ™ ! #BARforhoodies
Just beachy
Last minute dip. No bottoms, no problem. #nothingisgonnaruinmyday πŸ‡§πŸ‡ΈπŸ™πŸ½β˜€οΈπŸŒ΄
Bae Watch ! #donthasslethehoff @micahmarcus
Cheers to the (almost) weekend πŸ’ƒπŸ»βœŒπŸ½οΈ trying to figure out what to wear on Kelly & Michael and I'm thinking I'll just go with this look πŸ˜œβ˜€οΈ
In paradise πŸŒ΄β˜€οΈπŸ’‹
He'll be a merman in no time thanks to @thewaterwhisperer #mumlife ✨
@bowie82 and I enjoying some time at the pool before celebrating @samanthapatridge 21st!!!!
Feeling motivated to eat my greens.. πŸ˜‚πŸŒ΄ #SundayFun #SportsIllustrated
Sundays are for hanging around 😎
Girls just wanna have sun πŸ˜œβ˜€οΈπŸŒ΄ #happysaturday πŸ“·: @farrahaviva
Beachin' w the bday girl!
So much fun relaxing this weekend. Monday came right at me like...
Double trouble @stellahudgens #sistasista
Oh hey there :) snapchat bellathornedab 😍😝 #miami #flexfriday #happyfriday #casualfriday #badass #treatyoself #southFlorida #curlyhair
Into the wild 🐯🐯🐯 @victoriassecret #puravida
Go on.
Mama and her ducklings
With my #island baby🌺 @sophialabraham #hawaii #BestHawaiiTripEver @hotmiamistyles #beach #beachbody #summer #beachbunny πŸŒŠπŸŒΊπŸŽ‰βœ¨πŸŒ΄
❀️Paradise........ #Fuchsia #DayDreamin
Happiness
Take me back to the Maldives (+alcohol!) 🐬🌴🐚πŸŒͺπŸ’¦
πŸ‘‘
Dinner with mah babe @cash_warren 🌺#adultspringbreak
My girl craved some vitamin D β˜€οΈ #5months βœ‹πŸΌ
Oh it's a rough day here in paradise it's cloudy oh well just have to make the best of it. 🌴 #poweofpositivethinking
The most beautiful day.. πŸŒΊβ˜€οΈ
just like heaven ...
Look who I found?! 🌴
#Hawaii Time🌺🌊❀️🌴 @SophiaLAbraham #ALOHA 🐒
❀️It feels good to remember who you are before the world told you who you should be........ #Solitude #Authenticity #Clarity
πŸ’€πŸ‘…πŸŒž
Preeeeeety #vacay2016 #thisis41
My Mai Tai is as big as my head. This one is for my Grandmother Sugarplum who loved her "high tides" whenever she was in Hawaii. I think she would have loved this one.
Sisters in Paradise 🌊
This is 14. Omg. 🌴πŸŒͺπŸ‘― #spingbreaking with our friend @ellataitelman and our @mimsygray
Sunday funday!
Just chilling β˜€οΈ
Finally some relax time 😍😘 so happy I had this boy supporting me here :) now headed back to LAπŸ‘™πŸ‘‘@greggsulkin #sxsw #iloveyou #happytuesday #traveltuesday #tan #tot #pool #boyfriend
We are NOT horsing around πŸ˜‚πŸ˜‚ #MLS #sissysquad #plusmom #hydrate
Havin fun in the sun in my @alleaswim 😎 #nofilter #bikini #girls #bffs #happytimes #caligirl #springbreak
Hat game on point! @katherineh82 @marabethpoole #msl #hydrate #sissysquad #plusmom πŸ˜‚
Missing that catamaran life! #noonecallsmecaptainhere πŸ˜žβš“οΈ
Of Course I Couldn't Do It Without The Help Of My Partner In Crime.... #ProudMoment 🐟
She takes #BAYWATCH to another level.. World fell in love with @alexannadaddario in #SanAndreas and I was so impressed by her chops and presence every day, that I had to have her "rep the squad" in our film. Just wait til you see her - and all our girls - kick ass and protect the bay. #GameOver #BaywatchBabes #CoverYourEyesBoys #BAYWATCH SUMMER 2017.
That time I hung out with the @VictoriasSecret Angels… watch me & @ddlovato on #VSSwimSpecial, tonight 9/8c @cbstv
So many beautiful and authentic locations for the filming of The Return of Xander... Blessed.
Left my phone behind to be present! I am so grateful for the people I've met this year but more importantly for the people who have been consistent and by my side through thick and thin. That'd be YOU. Thank you for another year! Love you guys!
Just another manic Monday 😏 @janellehansen
No shoes no shirt no problems 🐳🍍🌴
Happy Happy Birthday to my favorite twins and members of our girl group! 🎈🎈
43 is good... Very good #islandvibes
So long Curacao! Refreshed and ready to see what's next... 🍹🍍🌴🌞🌞🌞
Happy Friday! β˜€οΈ
🌴
πŸ’‹πŸ™ŒπŸ»πŸ˜
My magic πŸ‘ΌπŸΌπŸ’•
#roomwithaview #napa #castlelife #familytime
99 problems but a beach ain't one. πŸ˜‚πŸŒ΄β˜€οΈ I am seriously in #paradise and can't get enough! #maui #badjoke #WestinKaanapali #SiegfriedGetaway #1year
Another view of lovely Savannah
Super casual spa-wear 🌳
Primera vez en una piscina! First time in a pool!
#CoachellaKitty 🎢🌴🐱🌴🎢
😎
Beach Bum 🌴🌞🌴 #Bahamas πŸ‡§πŸ‡Έ
Ride the black swan πŸŽ‚πŸŽ‰πŸŽ‰πŸŽ‰ #bestfriends ever #electrablue
Getting the Tum in the the sun πŸŒžπŸ‘™πŸŒžπŸ‘™
Beautiful Sunday 🌞
If this is wrong I Don't want to be Right.... ✌️ #turksandcaicos #vaca
🌺So much fun on my early bday celebration πŸŽ‚ feeling loved and blessed.
COA... Chilling with my baby boy πŸ’¦πŸŒ΄β˜€οΈπŸ’•πŸ€#coachilling #foreveronvacation #week2 @coachella
So far so good πŸŒ™ πŸ‘ΆπŸΌπŸ‘£
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