No prizes for guessing who Keith Urban's No. 1 fan is -- it is clearly Nicole Kidman!

The Oscar-winning actress gushed about her husband's upcoming album, "Ripcord," to ET at the Academy of Country Music Awards in Las Vegas, Nevada on Sunday night. "It is such a crazy good album," Kidman told us.

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"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."

All those compliments made the "Wasted Time" singer blush! The modesty was unwarranted, though, as Urban's fiery performance during the award show proved.

Meanwhile, we were No. 1 fans of Kidman's A-list red carpet look! She brought the couture glam wearing a sheer Alexander McQueen dress with embroidered embellishments.

The celeb couple revealed they are frequent visitors to Sin City -- and that Kidman is a bit of a gambler! "She's very good," Urban said. "She's disciplined."

"Well I'm not very good. I have a little amount of money, I go and bet that and then I’m done," the "Secret in Their Eyes" actress admitted. "I'm that kind of gambler, I'm not going to bet the house."

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Well that's a relief!