After performing during the Jingle Ball, the 21-year-old singer and about 20 of her friends partied at Hyde Lounge at the Staples Center.
Cyrus' entourage included good friends, her make-up team, backup dancers, band members and the one and only Amazon Ashley (above), toofab has exclusively learned.
We're told there was a feast from Katsuya waiting for the group when they arrived around 12:45 AM, with a spread including salmon sashimi, crispy rice, crab hand rolls, tuna rolls, California rolls and Rock Shrimp tempura roles.
The entire crew got down on the dance floor all night long to hip-hop classics -- with Miley even stepping back and watching some of her professional dancers do their thing.
Cyrus, clearly happy that she just turned 21, was even heard joking to a friend "Watch me walk over to the bar and order a drink!"
Her poison: Malibu Rum and watermelon cocktails.
Check out Miley's interesting holiday performance from the Jingle Ball below -- how do you think she did?