Mariah Carey baffled by son Moroccan's bizarre on-stage stunt

Mariah Carey and her children Moroccan and Monroe pictured in 2017. Photo / Getty Images

Mariah Carey was left baffled by her son's on-stage actions during her first comeback performance in Las Vegas on Thursday.

The Fantasy hitmaker was joined onstage by her seven-year-old twins Moroccan and Monroe but was shocked when her beloved son decided to pull a black plastic bag over his head during her performance.

Looking visibly shocked as Moroccan encased his head in the plastic, the songstress quickly turned back to her son to whip the bag off him and continued her performance, the Daily Mail reports.

The performance was the singer's first concert of her new residency, The Butterfly Returns.

She will perform at The Colosseum inside Caesars Palace until September when her residency ends.

However, PageSix has claimed tickets have not been selling well and the 4,300 seats are far from selling out.

"It's a disaster. Scalpers bought a bunch of the tix and are freaking out," a source told the site.

LiveNation, however, maintained it is "pleased" with the sales.

And Mariah's publicist denied the claims: "These allegations are false and come from a source that must be desperate to pretend to be in the know . . . Look forward to seeing you at the Vegas show — if you can get a seat!"

After the conclusion of her residency, the star will embark on her 10th headline tour, the Number 1's tour which will see her return to New Zealand this October.