To celebrate Throwback Thursday, M rounded up some pretty awesome baby pics of all your favorite celebs like Austin Mahone, Keaton Stromberg, and Bradley Simpson. So only one question remains: Are you ready for the ultimate guessing game? We'll give you a baby pic, then it's up to you to guess who it is. Click through to the next slide to reveal the answer!
How many did you guess correctly? Click all the way through the gallery to finish the game, then tell us in the comments what your score was!