Merry Christmas & Happy Holidays, M Girls! Christmas is a super exciting day filled with gift-opening, cookie-eating, and of course, laughing and enjoying your family's company. Once you're done with opening gifts, spending quality time with your fam, and all that other good stuff, we're challenging you to take on our most popular guessing game post of 2013.
Put your celeb knowledge to the test and see if you know which star was born first. Who's older — Wesley Stromberg from Emblem3 or Justin Bieber? Is Harry Styles younger or older than Raini Rodriguez from Austin & Ally? Let's see how many you can get right!
Play the guessing game by clicking through the gallery. Tell us your score in the comments!