We already know that Miley Cyrus bailed out on Linda Perry's concert on Tuesday celebrating the music from the film Freeheld… so let's focus on who was there!
Turns out, it was a pretty poppin' party!
Former pop star rivals Jessica Simpson and Christina Aguilera were both in attendance, but only Xtina took the stage to perform her rendition of Mother by John Lennon.
Related: Celebs Who Are MILFs!
Other performers in front of the intimate crowd included Juliette Lewis, Courtney Love, and even Jess' lil sis, Ashlee Simpson.
The Simpson sister's were accompanied by their husbands and were spotted sipping wine and cocktails throughout the event. An onlooker told People:
"Ashlee and Evan [Ross] acted like newlyweds. They were cuddled up together in a booth, laughing and showing off cute PDA. Jessica looked really happy to be hanging out with them and seemed to get along great with Evan. Eric [Johnson] and Jessica did their own thing at the party and would check in on each other every now and then. He came over to introduce himself to her friends a few times and would run close to the stage to take photos of the performances."
As for the returning Voice judge, she pushed through her sickness to support Perry:
"Her fiancé [Matt Rutler] held her hand on the way up. She said she was getting over the flu but wanted to come and support Linda."
Watch Miz Aguilera's stunning performance (below)!