According to ABC 7 News, here were over 200 guests at the the Playboy Mansion themed party, and most of the underage girls were wearing lingerie and drinking alcohol.
The birthday girl's father was present at the party.
Photos of 18-year-old Olivia's party were posted all over Instagram, which soon caught the attention of police.
It allegedly took "a small army of sheriff's deputies" to shut it down and arrest the girl's father.
He now faces up to six months in prison for giving alcohol to minors (in America, you cannot legally drink until you're 21).
Steve Voss, Mayor of Poway, California, has publicly rebuked the father for his behaviour, saying: "It's as though you are handing out hand grenades as party favours.
"It's a disaster waiting to happen."
Ironically Olivia's mum, a former PTA president, is said to have tweeted: "Happiest birthday to the baddest B in town...now don't get arrested."