Mark Ballas Serenades Sabrina Bryan

Now that Mark Ballas and Sabrina Bryan are officially a couple, they aren't holding anything back.

The Dancing with the Stars professional, fellow pro Derek Hough and their band Almost Amy took to the stage at Hollywood club Sugar last night.

Bryan stood in the front row... until Ballas dedicated the band's first number to "my beautiful Sabrina" and the Cheetah Girls member got on stage to shake what her mama gave her.

"Isn't he the cutest thing in the world," Bryan gushed to People magazine moments after Ballas presented her with a large bouquet of flowers.

"I think it's so cool that they are dating," Cameron Mathison said. "They are so cute together."

We couldn't agree more. And hope to see Sabrina, Mark, Brad Womack and DeAnna Pappas go on a double date in the near future.