Nicole Kidman, 48, shows off toned physique, proves she's ageless in a hot bikini

Nicole Kidman Looks Flawless in Her Bikini at 48 -- See the Pic!

Keith Urban is probably still celebrating Thursday night's American Idol series finale (and Trent Harmon's surprising victory!), but that's not his biggest win -- it's his hot wife, Nicole Kidman.

The How to Talk to Girls at Parties actress was recently spotted at Balmoral Beach in Sydney, Australia, looking fit and flawless while taking an early morning dip in the sea.

WATCH: Nicole Kidman Loves Dancing to Keith Urban's 'Sun Don't Let Me Down'

Kidman, 48, went makeup-free and rocked an itty bitty floral two-piece, which perfectly showed off her toned tummy, rock-hard arms and slender legs.

Simply stunning!

See Nicole Kidman with her famous hubby:

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Keith Urban and Nicole Kidman together
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Nicole Kidman, 48, shows off toned physique, proves she's ageless in a hot bikini
NEW YORK, NY - MAY 29: Actress Nicole Kidman (L) and musical artist Keith Urban embrace onstage during Lincoln Center's American Songbook Gala at Alice Tully Hall on May 29, 2018 in New York City. (Photo by Mike Coppola/Getty Images for Lincoln Center)
NEW YORK, NY - MAY 29: Actress Nicole Kidman (L) and musical artist Keith Urban embrace onstage during Lincoln Center's American Songbook Gala at Alice Tully Hall on May 29, 2018 in New York City. (Photo by Mike Coppola/Getty Images for Lincoln Center)
NEW YORK, NY - MAY 29: Actress Nicole Kidman (L) and singer-songwriter Keith Urban attend Lincoln Center's American Songbook Gala at Alice Tully Hall on May 29, 2018 in New York City. (Photo by Mike Coppola/Getty Images for Lincoln Center)
NEW YORK, NY - APRIL 24: Musician Keith Urban and actor Nicole Kidman attend the 2018 Time 100 Gala at Jazz at Lincoln Center on April 24, 2018 in New York City. (Photo by Dimitrios Kambouris/Getty Images for Time)
LAS VEGAS, NV - APRIL 15: Nicole Kidman (L) and Keith Urban attend the 53rd Academy of Country Music Awards at the MGM Grand Garden Arena on April 15, 2018 in Las Vegas, Nevada. (Photo by J. Merritt/Getty Images)
LAS VEGAS, NV - APRIL 15: (L-R) Blake Shelton, Gwen Stefani, Nicole Kidman and Keith Urban attend the 53rd Academy of Country Music Awards at MGM Grand Garden Arena on April 15, 2018 in Las Vegas, Nevada. (Photo by John Shearer/ACMA2018/Getty Images for ACM)
LOS ANGELES, CA - JANUARY 21: (L-R) Nicole Kidman and Keith Urban arrive at the 24th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 21, 2018 in Los Angeles, California. (Photo by Dan MacMedan/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Singer Keith Urban (L) and actor Nicole Kidman attend The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - NOVEMBER 19: Actress Nicole Kidman (L) and singer/musican Keith Urban attend the 2017 American Music Awards at Microsoft Theater on November 19, 2017 in Los Angeles, California.(Photo by Jeffrey Mayer/WireImage)
NEW YORK, NY - NOVEMBER 13: Keith Urban and Nicole Kidman attend the 2017 Glamour Women of The Year Awards at Kings Theatre on November 13, 2017 in New York City. (Photo by Noam Galai/WireImage)
NASHVILLE, TN - OCTOBER 18: Recording artist Keith Urban and actress Nicole Kidman attend the 2017 CMT Artists Of The Year awards at Schermerhorn Symphony Center on October 18, 2017 in Nashville, Tennessee. (Photo by Mickey Bernal/FilmMagic)
LOS ANGELES, CA - SEPTEMBER 17: Nicole Kidman, Keith Urban arrives at the 69th Annual Primetime Emmy Awards at Microsoft Theater on September 17, 2017 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
TORONTO, ON - SEPTEMBER 08: (L) Nicole Kidman and Keith Urban attend 'The Upside' premiere during the 2017 Toronto International Film Festival at Roy Thomson Hall on September 8, 2017 in Toronto, Canada. (Photo by Kevin Winter/Getty Images)
NASHVILLE, TN - JUNE 07: (L-R) Carrie Underwood, Nicole Kidman and Keith Urban in the audience during the 2017 CMT Music Awards at the Music City Center on June 7, 2017 in Nashville, Tennessee. (Photo by Jeff Kravitz/FilmMagic)
NASHVILLE, TN - JUNE 07: Musician Keith Urban and actress Nicole Kidman attend the 2017 CMT Music awards at the Music City Center on June 7, 2017 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for CMT)
NASHVILLE, TN - JUNE 03: Actress Nicole Kidman and Keith Urban attend the Stanley Cup Finals Game 3 Nashville Predators Vs. Pittsburgh Penguins at Bridgestone Arena on June 3, 2017 in Nashville, Tennessee. (Photo by Terry Wyatt/Getty Images)
CANNES, FRANCE - MAY 22: Keith Urban and Nicole Kidman depart after the 'The Killing Of A Sacred Deer' screening during the 70th annual Cannes Film Festival at Palais des Festivals on May 22, 2017 in Cannes, France. (Photo by Gisela Schober/Getty Images)
CANNES, FRANCE - MAY 22: Nicole Kidman (L) and Keith Urban attend the official after party for 'The Killing of a Sacred Deer' at the Nikki Beach pop-up during the 70th annual Cannes Film Festival on May 22, 2017 in Cannes, France. Guests enjoyed Perrier Jouet. (Photo by David M Benett/Dave Benett/Getty Images for Nikki Beach)
LAS VEGAS, NV - APRIL 02: (L-R) Singer Keith Urban, actor Nicole Kidman, and singers Faith Hill and Tim McGraw attend the 52nd Academy Of Country Music Awards at T-Mobile Arena on April 2, 2017 in Las Vegas, Nevada. (Photo by Jeff Kravitz/ACMA2017/FilmMagic for ACM)
LAS VEGAS, NV - APRIL 02: Actor Nicole Kidman (L) and singer Keith Urban attend the 52nd Academy Of Country Music Awards at Toshiba Plaza on April 2, 2017 in Las Vegas, Nevada. (Photo by Jeff Kravitz/ACMA2017/FilmMagic for ACM)
Actress Nicole Kidman and husband Keith Urban arrive at the 23rd Screen Actors Guild Awards in Los Angeles, California, U.S., January 29, 2017. REUTERS/Mario Anzuoni
Actress Nicole Kidman and husband Keith Urban arrive at the 23rd Screen Actors Guild Awards in Los Angeles, California, U.S., January 29, 2017. REUTERS/Mario Anzuoni
Cast member Nicole Kidman and her husband Keith Urban pose at the premiere of the HBO television series "Big Little Lies" in Los Angeles, California U.S., February 7, 2017. REUTERS/Mario Anzuoni
Cast member Nicole Kidman and her husband Keith Urban pose at the premiere of the HBO television series "Big Little Lies" in Los Angeles, California U.S., February 7, 2017. REUTERS/Mario Anzuoni
52nd Academy of Country Music Awards - Arrivals - Las Vegas, Nevada, U.S., - 02/04/2017 - Actress Nicole Kidman and musician Keith Urban. REUTERS/Steve Marcus
52nd Academy of Country Music Awards - Arrivals - Las Vegas, Nevada, U.S., - 02/04/2017 - Actress Nicole Kidman and musician Keith Urban. REUTERS/Steve Marcus
70th Cannes Film Festival - Screening of the film "The Killing of a Sacred Deer" in competition - Red Carpet Arrivals - Cannes, France. 22/05/2017. Cast member Nicole Kidman and her husband Keith Urban pose. REUTERS/Eric Gaillard
NASHVILLE, TN - JUNE 10: Nicole Kidman and Keith Urban attend the 2015 CMT Music awards at the Bridgestone Arena on June 10, 2015 in Nashville, Tennessee. (Photo by C Flanigan/WireImage)
NASHVILLE, TN - JUNE 10: Nicole Kidman and Keith Urban attend the 2015 CMT Music awards at the Bridgestone Arena on June 10, 2015 in Nashville, Tennessee. (Photo by C Flanigan/WireImage)
CANNES, FRANCE - MAY 19: Keith Urban and Nicole Kidman attend the Premiere of 'Inside Llewyn Davis' at The 66th Annual Cannes Film Festival on May 19, 2013 in Cannes, France. (Photo by Tony Barson/FilmMagic)
NASHVILLE, TN - JUNE 05: Musician Keith Urban and actress Nicole Kidman attend the 2013 CMT Music Awards at the Bridgestone Arena on June 5, 2013 in Nashville, Tennessee. (Photo by Jeff Kravitz/FilmMagic)
MELBOURNE, AUSTRALIA - JUNE 13: Actress Nicole Kidman and Keith Urban attend the Celebrate Life Ball at Grand Hyatt Melbourne on June 13, 2014 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)
NASHVILLE, TN - NOVEMBER 04: Actress Nicole Kidman and singer-songwriter Keith Urban attend the BMI 2014 Country Awards at BMI on November 4, 2014 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for BMI)
Australian actress Nicole Kidman (L) and her husband musician Keith Urban (R) kiss as they pose for pictures on the red carpet upon arrival for the world premiere of 'Paddington' in London on November 23, 2014. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
LOS ANGELES, CA - FEBRUARY 08: (EDITORS NOTE: Image was processed using digital filters.) Musician Keith Urban and actress Nicole Kidman attend The 57th Annual GRAMMY Awards on February 8, 2015 in Los Angeles, California. (Photo by Christopher Polk/WireImage)
CENTURY CITY, CA - JUNE 16: Honoree Nicole Kidman (L) and recording artist Keith Urban attend the Women In Film 2015 Crystal + Lucy Awards Presented by Max Mara, BMW of North America, and Tiffany & Co. at the Hyatt Regency Century Plaza on June 16, 2015 in Century City, California. (Photo by Mark Davis/Getty Images for Women in Film)
HOLLYWOOD, CA - MAY 13: Singer Keith Urban and actress Nicole Kidman attend the 'American Idol' XIV grand finale at Dolby Theatre on May 13, 2015 in Hollywood, California. (Photo by Tommaso Boddi/WireImage)
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The ageless beauty was joined by her mother, Janelle Ann Kidman, who fully submersed herself in the water for a relaxing mother-daughter swim session.

Earlier this month, ET caught up with Kidman on the red carpet at the Academy of Country Music Awards in Las Vegas, where she couldn't stop gushing over her husband's upcoming album, Ripcord.

WATCH: Nicole Kidman Praises Keith Urban's Music, Makes Him Blush

"It is such a crazy good album," Kidman -- who Urban says inspired the album -- told ET's Sophie Schillaci. "I've been living with all the songs -- and even the songs that didn't make the album. I've seen the work he puts into it and the love. He's a musician, so every little tiny detail is all him, and I love that. I love that he's passionate about his music."

The adorable duo will be celebrating their 10-year wedding anniversary in June, and clearly, they're still smitten.

When ET chatted with the couple at the SAG Awards back in January, they revealed their secrets to keeping their marriage alive after all this time.

"Just want it more than anything," Urban, 48, explained. "That's it, isn't it?"

WATCH: Nicole Kidman & Keith Urban Reveal How They Make It Work After 10 Years Together

"Yeah, prioritize it," Kidman added. "Also, as much as we love each other, we really like each other. I'm speaking for myself, but that is a huge part of being married. Always, the first person I want to share anything with is him. It's true."

Related: Also see more celebs hit the beach in skimpy swimsuits:

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Spring Break 2016 - Stars in Bikinis
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Nicole Kidman, 48, shows off toned physique, proves she's ageless in a hot bikini
My number one ho
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See the light in others and treat them as if that is all you see. -Wayne Dyer #letThereBeLight
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