It looks like SO many of these celebs stayed at  — and prepped and changed at — The Mark Hotel, which is right by the Met, and the Mark Hotel has got to be LOVING all the PR from people cooly strolling out their front doors. In other news, there are some nipples in here, so….you know. Take heed.

Also, this is obviously amazing:

J.Lo, truly, has seen it all. Katy Perry struggling to get into a hamburger? Big deal.

[Photos: BFA/Zach Hilty, Erik Pendzich/REX/Shutterstock, ANDREW MORALES/WWD/REX/Shutterstock, Broadimage/REX/Shutterstock,  Paul Zimmerman/WWD/REX/Shutterstock]