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Justin Bieber, David Arquette

Gabe Ginsberg/Getty Images

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."

Justin Bieber

Courtesy Denise Truscello/WireImage

"There was no altercation," the insider adds. "It was simply that Justin wanted to be with his close friends. He had had a long day and just wanted to be low-key and relax."

But Arquette wasn't totally unwanted at the Biebs' celebration. The 43-year-old actor was in attendance earlier in the night because he's actually an investor in the Heart of Omnia, a smaller, more private club separate from Omnia Nightclub.

As for his big Omnia bash, a source told E! News after the party of Bieber, "He was in great spirits. He was having a great time with his friends...He looked good."