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Mariah Carey and Nick Cannon  are expecting twins, but they weren’t expecting this! Apparently the twins aren’t just boys or girls, but a boy and a girl. The best of both worlds really and another one for the celebrity baby books: Jennifer Lopez’s twins Max and Emme, Julia Roberts’ twins Hazel and Phinnaeus, and of course, the Jolie-Pitt twins Knox and Vivienne. “There were fan contests on Twitter about what gender they are and rumors about them being two boys or two girls – but nobody guessed this!” said Mariah Carey.