Mariah Carey Celebrates Another Set of Vegas Shows, Does Will Ferrell's Makeup Backstage

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Photo: WireImage
What's a diva to do after wrapping the third run of her Vegas show? Host a fabulous party, of course!
That's exactly how Mariah Carey celebrated her latest string of dates at The Colosseum at Caesars Palace, where she's been performing "Mariah #1 to Infinity," a show featuring her chart-toppers, since early 2015.
Carey was positively glowing at the post party, which was held at 1 OAK Nightclub, located inside the Mirage Hotel & Casino. Dressed in a Roberto Cavalli metallic mini dress -- with her enormous engagement ring courtesy of fiancé James Parker on full display -- Carey greeted fans, friends and family by blowing kisses as she strolled into the nightspot. 
Photo: Denise Truscello/WireImage
And in true Mariah style, there were sparkly things! A pink, white and gold chevron-patterned cake covered with glitter and rhinestones was presented to the singer. 
Photo: Denise Truscello/WireImage
The evening was a sweet, sweet fantasy indeed, with dancing, singing and selfies, but the night before may have been even cooler, thanks to one very special guest: Will Ferrell!
The 48-year-old actor got snazzy in a suit when he showed up to the chanteuse's Vegas show on Friday, and the “One Sweet Day” singer was clearly excited to have him in attendance.
"Shake and bake!!" Carey captioned a photo of the two on Instagram, which she shared on Saturday. "Thank you for coming to my show last night!! #elf forever!!" 

While backstage, the 45-year-old singer put her beauty school days to good use, hilariously dabbing makeup on Will Ferrell's cheek. 

Not a bad way to wrap up a weekend in Vegas!
Look for more Mariah at Caesars Palace in Vegas this summer, beginning June 7. Until then, here's a peek at her stage show.