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Kaitlin Olson, Rob McElhenney

Leo Grey McElhenney – April 5
Life got a lot sunnier for “It’s Always Sunny in Philadelphia” stars Kaitlin Olsen and Rob McElhenney on April 5 when the comedic couple welcomed their second son, Leo Grey, into the family (big brother Axel Lee was born in September 2010). Although the actress tweeted that the birth was “23 very very long hours,” she added, “We’re in love.”

Celebrity Babies of 2012

Blue Ivy, Maxwell Drew, and Tennessee James are just three of the many, many bundles of joy the stork dropped off in Hollywood this year.