So the extrovert singer was understandably in the mood for some poolside fun and games as she toasted her final night in the desert city surrounded by bikini-clad lovelies, along with husband Stephen Belafonte.
The party at the MGM Grand hotel, once famous as a hangout for Frank Sinatra and his rat pack crew, also served as a belated birthday bash for the former Spice Girl, who turned 34 on May 29.
Full of high spirits at her big send-off, Mel B - looking fit and fabulous in a saucy two-piece featuring a red lipstick kiss pattern and matching stilettos - broke into into an impromptu dance as she was presented with a celebratory cake.
But her routine from now on won't just revolve round the school run and supervising homework. Sources say that the former Spice Girl is to start work on a movie, with "several big names".