Hannah Montana star Miley Cyrus took over Disneyland in America for a massive party to celebrate her 16th birthday.
Miley's birthday isn't until the 23rd of November, but she's so busy, Sunday was the only time she had for the big bash!
Loads of celebs turned up to the 'Sweet 16' party.
Five hundred people paid $250 - that's almost £150 - each!
Some of the money raised will go to Youth Service America, an organisation which tries to encourage young people to work as volunteers.
Miley treated the party-goers to a performance of some of her hit songs...
And her dad, Billy Ray Cyrus, took to the stage too, performing a few songs of his own, including Achy Breaky Heart, which was a hit back in 1992!