Jennifer Lopez, 42, stunned many with her turquoise, fitted dress and matching clutch purse. The American Idol judge was all dressed up for her boyfriend, Casper Smart's 25th birthday celebration. Her low cut and clingy gown showed off her famous assets and definitely stole the spotlight from Smart. 

Lopez and Smart hung in West Hollywood at a hot spot named 'Cecconi's.' Smart, a dancer, was less dressy with a grey hat and a black zip up shirt. However, the couple seemed elated after exiting the restaurant that night and heading to their car. 

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"We hope Beau has the happiest Birthday Beau ever has" Lopez tweeted yesterday.

Lopez debuted her steamy new music video for 'Dance Again' on American Idol on Thursday. The video featured some intimate scenes with Lopez wearing a fitted black basque and Smart, shirtless. The video definitely made headlines for the couple of less than one year.