Chris Brown headlined Power 106's Powerhouse 2013 concert at Anaheim's Honda Center Saturday and treated fans to a very special performance with Nicki Minaj, in which he slapped her butt.

The 24-year-old singer performed hits including "Fine China," his new single "Don't Think They Know," "Beat It," "For the Road" and "Shots Fired." He brought out a number of guests such as Sean Kingston, Tyga and Tank, but the crowd exploded when Minaj walked on the stage to perform a medley of hits.

Minaj entered the stage wearing pants and a black top in high heels, rapping her verse to DJ's Khaled's "Take It To The Head." As she hit center stage, Brown playfully slapped her butt. She continued her set with "Beez in the Trap" and "High School."

"Thanks for showing love at powerhouse!!! Means a lot to me. Thank you," Brown told Minaj.

He later took to Twitter to thank his fans who supported him at the concert.

"California i appreciate you! #Powerhouse was so much fun!" he tweeted Sunday. "Thanks to everyone who came out last night!"

Brown and Minaj will be seen performing at the 2013 BET Awards on Sunday. The event hosted by comedian Chris Tucker, will feature other performers including, Mariah Carey, Miguel, Ciara, R. Kelly and Kendrick Lamar.

Meanwhile, TMZ reported Monday that Brown was involved in an altercation with a woman who claimed that she was in the VIP section at Heat Ultra Lounge in Anaheim, Calif, where the Fine China singer had just performed on June 22.

When the club was about to close, Deanna Gimes claimed that Brown deliberately shoved her to the ground, so hard that she fell hard to her knees.

In the photo obtained by TMZ, Gines said she went to the hospital shortly after the incident, only to discover that she suffered torn ligaments in her right knee.

Mike Joher, the owner of the club where the alleged incident took place, said that the claim is false.

"Based on the information which we have gathered from our security company, mall security, and other party goers which were at HEAT on Saturday night; It is apparent that the alleged incident regarding Chris Brown is false," Joher said.

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Chris Brown, Nicki Minaj