Justin has poker-themed birthday bash

Justin Timberlake enjoyed a poker-themed party to celebrate his 24th birthday earlier this week.

The singer was joined by girlfriend Cameron Diaz and celebrity friends Leonardo DiCaprio, Tobey Maguire and Adam Levine at the bash, which was held at his Hollywood home.

"I left at 3 am and it was still going strong," one party-goer told Insider Online. "Justin didn't leave the table once all night."

As to whether Timberlake won big? "He's not that good," the source added. "But Tobey is another story. He really can play."