9. Tom Hanks In I Really Like You - Carly Rae Jepsen
Carly Rae Jepsen scored one of the biggest cameos of all time when the Canadian singer managed to secure none other than Tom Hanks for her I Really Like You video. Released just this month, the video made a huge stir online and in the media. As a result, it brought Jepsen, known for Call Me Maybe, back into the spotlight. As for Tom Hanks, he's been known for photobombing fans and doesn't seem to take himself too seriously, so this is right up his alley.