The American Idol judge hit the stage to perform a medley of hits including dancefloor favourite On The Floor, which of course called for a series of different costume changes (including an amazing glow-in-the-dark David Koma design - see below!)
J-Lo worked glow-in-the-dark David Koma and a Gaga-esque gold hair dress during the show. Photos:PA
In the flesh: Jennifer Lopez performs during the 2011 American Music Awards. Photo:Getty
High flyer: J-Lo had the audience on their feet with a typically high-energy routine. Photo:PA
It was a night worth celebrating for Jen as, show-stopping peformance aside, she also picked up the award for Favourite Latin Artist.
Bootylicious: J-Lo showed off her infamous curves in the figure-hugging body stocking. Photo:PA
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- Jennifer Lopez

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