Do you ever have random celebrity crushes for a little while?

I'll start liking celebrities and go through phases of different guys being my favourite. Ive had crushes about anton yelchin, Richard o brien, Matt stone, Forrest griffin, Elijah wood, keanu reeves, chris pontius and steve o. It's so strange I keep getting these random crushes on the weirdest of people. I have a boyfriend of five yrs though and I have fantasies about these guys. Is this wrong? Is it normal?