Nicole Kidman, 48, Shows Off Toned Physique, Proves She's Ageless in a Hot Bikini

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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.

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Simply stunning!

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."

To hear more on their admirable relationship, watch the video below.