Singer Mariah Carey, who is pregnant with her and her husband Nick Cannon’s first child, rocked the stage as she performed the new single “Oh Santa” and the classic “All I Want For Christmas Is You” during the Christmas Day Parade at Disney in Orlando on Friday (watch videos below).

Mariah Carey Pregnancy PHOTOS: Huge Baby Bump Debut In Brazil

The 41 year-old proudly showed off her baby bump in a sexy Mrs. Claus outfit. “You could really see the pronounced belly,” says an onlooker. “She’s definitely not hiding it.”

Mariah Carey On Pregnancy Rumors: “I’m Superstitious!”

“She was really energetic,” says a backstage source. “She had definite ideas about what she wanted onstage, and she was working really hard.” Mariah’s husband Nick was also part of Disney’s Christmas Parade, but he was across the country at the Disneyland Resort in California.

Mariah Carey & Nick Cannon Expecting Baby Boy!

Mariah Carey “Oh Santa/All I Want For Christmas” Disney Parade Videos