Last year, Nick and the twins also helped Mariah celebrate the spooky holiday
at a palatial Airbnb estate in Beverly Hills, California, as did the songstress' now-fiancé, James Packer
. Mariah dressed up as a "glamorous witch," while Roe was the pink Power Ranger and Roc was Batman."They wanted to be super heroes," Mariah told ET. "They've been celebrating Halloween since August. So I figured, you know, we should have something fun and a haunted house and really be festive so they can enjoy the holidays."