JoJo: Happy Birthday, Katy Perry!

JoJo waves to the cameras as she arrives to Katy Perry‘s birthday party at Sunset Beach in Los Angeles.

The 18-year-old brunette beauty was among one of the many guests who left the party with paint splattered all over their white outfits! Paint party!

JoJo was a bit late to the party, but that didn’t stop her from having a good time. Other party-goers included Taylor Swift and Matt Dallas.

10+ pics inside of JoJo celebrating Katy‘s birthday…