Jennifer Lopez Falls Down, Busts Her Butt At AMAs

Jennifer Lopez attempts a big jump and falls down on her ass while performing her new song “Louboutins” at the 2009 American Music Awards at L.A.’s Nokia Theatre on Sunday (November 22).

Thankfully she’s pushin’ plenty of cushion as the 40-year-old singer got back up right away, got into a costume change and finished off her knock-out performance.

Watch J.Lo falling on her ass at the AMAs below!

Later in the evening, Adam Lambert also took a tumble during his performance.