Close to one week before kids enjoy a little trick or treating, the "Obsessed" singer gathered her friends together for a family-friendly celebration Saturday evening in Los Angeles.
Mariah and her ex Nick Cannon came dressed to impress as they kept close to their five-year-old twins.
Moroccan opted to dress as the Super Mario Brothers with dad while Monroe showed her love for Disney as Rapunzel from the hit film Tangled.
Other guests who went all out for the festive bash included Tameka "Tiny" Cottie, Floyd Mayweather, Master P and Tamar Braxton who brought her whole family along.
As fans of the Mariah's World star know, Halloween is one of Mariah's favorite holidays.
In fact, last year's holiday party was held at a $15 million estate courtesy of Airbnb where guests enjoyed a dance floor, candy apple martinis for adults, fried mac and cheese for kids and Sugar Factory treats for all.
Before you start to think there was any tension between Mariah and Nick at this year's party, all signs point to two parents dedicated to co-parenting peacefully.
"[The twins] got to grow up in this, they didn't ask for this," Nick previously shared on The Amber Rose Show when discussing the spotlight. "Not only do they have to be in the public light, but then they have to deal with unorthodox households. So we just make sure that they're happy and they understand unconditional love."
Mariah later added to E! News, "We try to keep it, the co-parenting, so the kids can feel good about things like that and not feel like it's any weirdness…It's the right thing to do."
Don't miss the premiere of Mariah's World Monday 5 December in AU, only on E!