Jay-Z and Beyoncé Hypnotizing as Biggie and Lil' Kim for Costume Party

Jay-Z and Beyoncé won best couples Halloween costume by channeling another super famous hip-hop couple, Biggie and Lil' Kim.

Kelly Rowland threw a costume party at Poppy last night in West Hollywood, and featured a ton of musical heavyweights, like Usher, Jermaine Dupri, and Nas.

Jessica Alba even showed up, fittingly dressed as Juno.

Check out all the great costumes!