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Christina even sings a lullaby version of the PJ Masks theme song for her daughter every night. "It's a hard song to slow down," Christina jokes. "Oh, and she won't let me skip a lyric either." ...

The pop diva also came up with a lullaby version of the ‘PJ Masks’ theme song. Christina Aguilera slays on stage, but her 3-year-old daughter, Summer Rain, isn’t impressed.