It's not easy to upstage Mariah Carey, but her twin tots are so adorable that they emerge as stars in the diva's new video.

The music video is for Carey's collaboration with John Legend, "When Christmas Comes", but neither artist was quite as enjoyable to watch as Moroccan and Monroe.

The twin cuties are clad in little holiday outfits, stealing the show even with only a few seconds of face time.

If Carey and Cannon are to be trusted, Moroccan and Monroe are going to be even bigger stars than their parents.

"My children definitely have outgoing personalities. At six months, they know how to smile and pose on cue and they're already (comfortable) in front of the camera, so I think that's just in their DNA, so they're going to have that," Cannon revealed to Fox411's Pop Tarts column.

"My daughter screams louder than any scream I've ever heard before, and she definitely has the pipes like her mom. We just have to be able to control them and pitch them out and I think she'll definitely follow in her mother's footsteps," he adds.

But in an exclusive interview with Barbara Walters in October, Cannon says he wants "to make sure we get education first."

The video comes across as a family video, as it also featured Carey's husband of three years Nick Cannon. It will be a wonderful reminded down the line of the twins' first Christmas.

The superstar couple welcomed their twin son and daughter on the day of their anniversary in April.

They renewed their vows in an intimate ceremony in the hospital.

Both of them are first-time parents, having had difficulty conceiving after a miscarriage a few years ago.

"It kind of shook us both and took us into a place that was really dark and difficult," Carey recounts to Access Hollywood.

"It definitely brought us closer together. It strengthened our relationship so much. She handled it so well," Cannon says.