Justin Timberlake is one proud dad! The singer stopped by The Tonight Show Starring Jimmy Fallon on Thursday and graced the world with two precious new photos of his son, Silas. In one snapshot, Justin, who welcomed his son in April with his wife, Jessica Biel, is seen holding up the smiling boy close to the camera. In another, Jessica plants a sweet kiss on Silas' cheek as they are both wrapped in towels. Justin, who also performed a "History of Rap" segment with Jimmy, gushed about fatherhood, saying, "It is the most insanely amazing, wonderful, unbelievable thing to ever happen to you." Watch the full interview above, then check out Justin and Jimmy doing a "Single Ladies" dance routine at the US Open.