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Not only did Jennifer Lopez perform her hit single "Booty" at Fashion Rocks 2014 on Tuesday night at Barclays Center in New York City, but the 45-year-old mother of two showed off her incredible physique in a sexy Versace gown. The short and sparkly outfit she switched into when she took the stage was also Versace, and while the low-cut detailing on the front of the dress was the same, it showed even more skin -- especially in the back!

Before twerking up a storm Lopez addressed the crowd and said, "Tonight we're gonna give it to you ... Are you ready?" The show was hosted by Ryan Seacrest and Rita Ora, Nicki Minaj, Usher and Pitbull also performed.

In case you missed it, check out J. Lo's sexy performance below!