Kid-mas

They’re Mariah’s little helpers! “[I had] a moment with the kids on the stage,” Mariah shared earlier this month as her 7-year-old twins, Moroccan (left) and Monroe, sang with her at Motorpoint

Arena in Nottingham,

England. “They wanted to help make it festive!”

The singer’s All I Want for Christmas Is You European tour kicked off Dec. 1 in

Norway. “Roc and Roe have been practicing the background vocals,” she said. “We’re very excited about it!”