Mariah Carey and her daughter Monroe, 12, stun the crowd with their beautiful vocals as they sing Carey's 1994 hit "Jesus Born On This Day." They performed the duet during one of Carey's holiday concerts at the Hollywood Bowl in Los Angles, California. This is not the first time Monroe has joined her mother on stage. Last year, she sat next to her mother in a sparkly gown and sang "Away in a Manger" during one of Carey's Christmas shows in Toronto. It looks like Monroe is following in her mother's footsteps of showcasing her beautiful vocals!