Some of the world's biggest stars hit the stage at the Barclays Center in Brooklyn on Tuesday night for a can't-miss New York Fashion Week event, Fashion Rocks.
Featuring some killer performances and equally impressive red carpet fashion, the charity fundraiser had a couple big moments everyone will be talking about on Wednesday.
First, we need to talk about Jennifer Lopez.
The 45-year-old superstar absolutely slayed on the carpet, showing up in a "dress" that put one of her sexy stems and some crazy cleavage on display. This was definitely a show-stopper when it came to arrival style.
She later hit the stage to perform her ode to the tush, "Booty," where she proceeded to make sure everyone got an eyeful of hers. Sporting one of the shortest minis ever, J.Lo danced her ass off ... and then bent over and grabbed it for full effect.
Watch the booty shake to end all booty shakes below:
Lopez wasn't the only one singing about her curves though.
Nicki Minaj also performed during the televised concert, giving us another rendition of her butt tribute "Anaconda." Wearing a denim skirt, bedazzled bra and not much else, Minaj twerked it out with a pack of dancers as well -- putting both her cleavage and derriere on display.
It was definitely a battle of the booties!
And then there was Justin Bieber.
The singer was met by a sea of boos as he hit the stage to introduce Rita Ora -- but they gave way to some serious screaming after what happened next. While on stage with Lara Stone, he made it clear he only really felt comfortable in his Calvins, as in Calvin Klein underwear ... and then proceeded to strip down to them in front of everyone.
Say what you will about Bieber, but you gotta admit he looks pretty good in his skivvies.
Check out the gallery above for more moments and fashion from the show!