Jennifer Lopez arrived at the set of American Idol on Wednesday afternoon, and while she's always been a babe, she wasn't exactly glammed up when she walked into the studio -- Jenny from the block was wearing sweatpants!

But in typical J. Lo fashion, she looked amazing, and she draped a fur (hopefully faux) over her shoulders and rocked a pair of high-heeled sneakers. And can we talk about how perky her infamous booty is? We always have a hard time believing that she's 45 years old!

In addition to her Idol duties, J. Lo is currently developing a new series for NBC called California, and according to reports, she's in talks to appear on an episode of Empire next season. Whew! So what else has she been up to? Oh you know, just having casual lip-syncing contests with Pitch Perfect star Anna Kendrick on the side!

In a new promo for Lip Sync Battle, which is a competition show based off the skit created by Jimmy Fallon, the ladies went at it to J. Lo's hit "Booty." As much as we love the two of them taking the stage, we have to say, Stephen Merchant is totally amazing at the end: