Well this is embarrassing! Justin Bieber was singing festive Christmas songs on the Today Show, Wednesday morning when he forgot the lyrics to one of the most well known songs: Santa Clause Is Coming To Town.

In the second part of the song, you're supposed to sing, "He sees you when you're sleeping," but Justin went back to first part of the song, "He's making a list, he's checking it twice" and then kind of trailed off while singing. Oops! Mistakes happen and it's easy to forget lyrics when you have to sing so many songs, but still! Justin, you grew up with this song, you should know better! Check out the video below! (aceshowbiz)