Just like the “Facebook bra color” trend that hit the social networking site weeks ago, Facebook is now observing the “Doppelganger Week,” in which users change their profile pictures to photos of their celebrity look-alikes.

How exactly did this trend start? The Hufftington Post said a certain Bob Patel was behind all this, but how the Hufftington Post knew this information is unknown.

Apparently, there is a message that is going around Facebook that says: “It’s Doppelgänger week on Facebook; change your profile picture to someone famous (actor, musician, athlete, etc.) you have been told you look like. After you update your profile with your twin or switched at birth photo then cut/paste this to your status.”

Find out who your celebrity doppelganger is here.