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.

Rob McElhenney told his co-star Glenn Howerton he was dating Kaitlin Olson in the most It's Always Sunny in Philadelphia way, and Howerton's reaction was very Dennis like in the most hilarious way too.

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,