Oh Britney, that's quite the dress.
The 31-year-old star wowed in a plunging sheer-paneled mini-dress that flaunted plenty of cleavage on last night's episode of "X Factor."
The star was visibly nervous -- gritting her teeth and pursing her lips -- as she waited for her contestant, Carly Rose Sonenclar's name to be called, and looked more than a little perplexed when Simon Cowell's girl group, Fifth Harmony, was the first act to advance to next week's finale.
Though it looked like Spears wasn't sure if Soneclar would advance, she tweeted that she "wasn't worried for a second":
"I wasn't worried for a second - to the finals we go @CarlyRoseMusic!!! So happy to be a part of this journey with you sweetie. Wow!"
How does Britney Spears fare in the battle of celebrity cleavage?