On Monday, Mariah Carey stepped out solo for the Venice Family Clinic Silver Circle Gala at The Beverly Hilton Hotel in Beverly Hills. While she didn't have her fiancé, James Packer, by her side, she stayed close to her best friend, filmmaker Brett Ratner, who was ho**red with the Humanitarian Award for his philanthropic efforts in the entertainment industry, and even took the stage for a performance later in the night.