He's one of the world's biggest pop stars and he's just released his first Christmas album.
But that didn't stop Justin Bieber forgetting the lyrics to festive staple Santa Claus is Coming to Town during a live performance on The Today Show.
Bieber, performing in front of hundreds of fans and tens of thousands of viewers, forgot the words, repeatedly using the phrase "he's making a list" instead of the correct lyrics.
Several times he stopped singing, forgetting the lyrics completely, instead dancing around the stage and into the crowd.
Bieber released his Christmas album Under the Mistletoe, which features guest stars Busta Rhymes, Boyz II Men, Usher, Mariah Carey and The Band Perry, last month.
