It turns out Justin Bieber's 21st birthday celebration in Las Vegas this past weekend wasn't entirely drama free.

After celebrating at the Omnia Nightclub Saturday night with stars like Kris Jenner and her boyfriend Corey Gamble, Miguel, Katharine McPhee, Ashley Benson and Scooter Braun, the pop star continued the party inside his super-expensive suite at Caesars Palace where he eventually booted unwanted party guest David Arquette.

"Justin wanted David to leave because he wanted to have a private party with his close friends. This was in his suite after the nightclub appearance," a source tells E! News of the situation. "And while he likes David, David is not part of Justin's inner circle and so David was asked to leave, which he did."