Kelly Osbourne threw the ultimate birthday bash for her celeb BFF Miley Cyrus on Tuesday.

A 情報源 tells Us Weekly that Osbourne rented out Beacher's Madhouse inside the Hollywood Roosevelt Hotel to help the 19-year-old celebrate her special day.


"Her mom Tish went, and so did her boyfriend Liam [Hemsworth]," the 情報源 says of Cyrus. "The group was up until 3 a.m. just dancing up a storm and having fun."

Cyrus seemed quite impressed with Osbourne's planning skills, calling it "the best party ever" on Twitter. "Let's just say there was a unicorn in the lobby!" (An onlooker tells E! News there was a horse with a horn attached to its head inside the soiree.)



Prior to Tuesday's birthday blowout, Osbourne teased that it was "going to be the sickout thing [Miley has] ever seen in her life."



"That was my mission for her, to make her birthday...the best 日 ever."

Osbourne and Cyrus first became フレンズ while shooting the comedy So Undercover. The film has yet to be released.