He could still give you the best advice you’ve ever gotten and make you feel loved no matter what,’ wrote McElhenney, as DeVito celebrates his birthday

As Frank on the long-running FX comedy It's Always Sunny in Philadelphia, Danny DeVito is disgusting. In real life, he's lovely. Several of his costars, including Kaitlin Olson (Frank's daughter Dee),

DeVito's It's Always Sunny in Philadephia costars Rob McElhenney and Kaitlin Olson celebrated the actor's milestone birthday with touching tributes shared on their social media accounts. Alongside a photo of DeVito pointing to the camera,