By now you know of the rumor involving Justin Bieber and Mariah Yeater. She is the young lady accusing Bieber of fathering her 3 month old baby. Whether this is true or not remains to be seen, however the late night television crew has been having some fun with this story. Checkout what Jimmy Fallon did on his show in regards to this crazy story.Watch as Jimmy Fallon performs a parody of Bieber's hit song titled "Baby." Turn up the speakers and enjoy this bit of entertainment.