"The girls... @kimkardashian @ireneroth #ChristmasParty #holidayfun #themostmagicaltimeoftheyear," the "Booty" crooner captioned a snap, which showed her rocking a cut-out black dress standing next to Kim and another friend, who were both wearing all black.
The Keeping Up With the Kardashians star also posted the shot, writing, "Tonight was fun. Thank you @carolebayersager #HolidayMagic."
Nicole Kidman and Keith Urban also attended singer-songwriter Carole Sager's star-studded holiday bash, while Babyface provided some musical entertainment at the event.
In addition to J.Lo's fun-filled Saturday night, the American Idol judge made a big announcement this weekend, revealing on Instagram that fans can get a speak peek at her first world tour Dance Again on Dec. 31 at 9 p.m. on HBO.