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

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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
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Nicole Kidman, 48, shows off toned physique, proves she's ageless in a hot bikini
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)
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)
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)
Nicole Kidman, left, and Keith Urban arrive at the Oscars on Sunday, Feb. 22, 2015, at the Dolby Theatre in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Nicole Kidman, left, and Keith Urban arrive at the 57th annual Grammy Awards at the Staples Center on Sunday, Feb. 8, 2015, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)
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)
Keith Urban, left, and Nicole Kidman attend the 2015 GҀ™DAY USA GALA at the Hollywood Palladium on Saturday, Jan. 31, 2015, in Los Angeles. (Photo by Rob Latour/Invision/AP)
Nicole Kidman, left, and Keith Urban arrive at the Los Angeles premiere of "Paddington" at the TCL Chinese Theatre on Saturday, Jan. 10, 2015, in Los Angeles. (Photo by Rob Latour/Invision/AP)
Actress Nicole Kidman and singer Keith Urban hold hands as they pose for photographers upon arrival at the world premiere of the film Paddington in London, Sunday, Nov. 23, 2014. (Photo by Jonathan Short/Invision/AP)
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)
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)
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)
Nicole Kidman, left, and Keith Urban arrive at the 48th annual CMA Awards at the Bridgestone Arena on Wednesday, Nov. 5, 2014, in Nashville, Tenn. (Photo by Evan Agostini/Invision/AP)
Nicole Kidman, left, and Keith Urban arrive at the 2013 CMT Music Awards at Bridgestone Arena on Wednesday, June 5, 2013, in Nashville, Tenn. (Photo by Wade Payne /Invision/AP)
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)
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)
Actress Nicole Kidman, left, and musician Keith Urban arrive at the 70th Annual Golden Globe Awards at the Beverly Hilton Hotel on Sunday Jan. 13, 2013, in Beverly Hills, Calif. (Photo by Jordan Strauss/Invision/AP)
LOS ANGELES, CA - SEPTEMBER 23: Nicole Kidman and Keith Urban attend the Academy of Television Arts & Sciences 64th Primetime Emmy Awards at Nokia Theatre L.A. Live on September 23, 2012 in Los Angeles, California. (Photo by Tonya Wise/Invision for the Academy of Television Arts & Sciences/AP Images)
Actress Nicole Kidman, left, and musician Keith Urban depart following the screening of The Paperboy at the 65th international film festival, in Cannes, southern France, Thursday, May 24, 2012. (AP Photo/Lionel Cironneau)
Nicole Kidman, left, and Keith Urban arrive at the 47th Annual Academy of Country Music Awards on Sunday, April 1, 2012 in Las Vegas. (AP Photo/Isaac Brekken)
Nicole Kidman, left, and Keith Urban arrive at the 46th Annual Academy of Country Music Awards in Las Vegas on Sunday, April 3, 2011. (AP Photo/Chris Pizzello)
Nicole Kidman and Keith Urban arrive at the 53rd annual Grammy Awards on Sunday, Feb. 13, 2011, in Los Angeles. (AP Photo/Chris Pizzello)
Nichole Kidman, left, is joined by husband Keith Urban before the Golden Globe Awards Sunday, Jan. 16, 2011, in Beverly Hills, Calif. (AP Photo/Chris Pizzello)
Nicole Kidman, right, and Keith Urban arrive at the 37th Annual American Music Awards on Sunday, Nov. 22, 2009, in Los Angeles. (AP Photo/Chris Pizzello)
Country singer Keith Urban and actress Nicole Kidman attend the 43rd Annual Country Music Awards in Nashville, Tenn. Wednesday, Nov. 11, 2009. (AP Photo/Peter Kramer)
Actress Nicole Kidman kisses her husband, singer Keith Urban, as they attend the U.S. Open tennis tournament in New York, Monday, Sept. 7, 2009. (AP Photo/Jeff Christensen)
Keith Urban and wife Nicole Kidman arrive at the 43rd Annual Academy of Country Music Awards on Sunday, May 18, 2008, in Las Vegas. (AP Photo/Isaac Brekken)
Australian actress Nicole Kidman, right, and her husband, singer Keith Urban, arrive for the 80th Academy Awards Sunday, Feb. 24, 2008, in Los Angeles. Kidman will be a presenter during the Oscars telecast. (AP Photo/Kevork Djansezian)
Nicole Kidman and her husband Keith Urban sit in the stands of the Rod Laver Arena before the start of the Men's Singles fourth round match between Novak Djokovic of Serbia and Lleyton Hewitt of Australia at the Australian Open tennis tournament in Melbourne, Australia, Monday, Jan. 21, 2008. (AP Photo/Rick Stevens)
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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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J U N E 1 ✨
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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‡·
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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˜­
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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!
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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
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Just beachy
Last minute dip. No bottoms, no problem. #nothingisgonnaruinmyday πŸ‡§πŸ‡ΈπŸ™πŸ½β˜€οΈπŸŒ΄
Bae Watch ! #donthasslethehoff @micahmarcus
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In paradise πŸŒ΄β˜€οΈπŸ’‹
He'll be a merman in no time thanks to @thewaterwhisperer #mumlife ✨
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Into the wild 🐯🐯🐯 @victoriassecret #puravida
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Take me back to the Maldives (+alcohol!) 🐬🌴🐚πŸŒͺπŸ’¦
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Dinner with mah babe @cash_warren 🌺#adultspringbreak
My girl craved some vitamin D β˜€οΈ #5months βœ‹πŸΌ
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just like heaven ...
Look who I found?! 🌴
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πŸ’€πŸ‘…πŸŒž
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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 🌊
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Sunday funday!
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