Costar Glenn Howerton, who lived with McElhenney, said Olson would suddenly be too drunk and need to stay over.Actor Glenn Howerton didn't even pretend to be happy when he found out that roommate Rob McElhenney was dating Kaitlin Olson,

For Kaitlin Olson and Rob McElhenney, looking back on their whirlwind romance will always be a sunny time. The couple first met when Olson auditioned for the role of Sweet Dee for McElhenney’s show, It’s Always Sunny in Philadelphia.

The It's Always Sunny in Philadelphia costars, who met on the FX show in 2005 and married in 2008, welcomed their first son, Axel, in 2010. Their second son, Leo, joined the family in 2012.