Charlie Day's 'SNL' Monologue Interrupted By Danny Devito (VIDEO)

11/06/2011 01:48 pm ET | Updated Jan 06, 2012

Lovable "It's Always Sunny In Philadelphia" star Charlie Day hosted "Saturday Night Live" for the first time this weekend -- which is normally pretty nerve-wracking -- but thankfully he got some help with his monologue from a fellow "Sunny" actor.

Yes, Danny DeVito dropped in on Day while he was talking about his latest accomplishments with the "SNL" audience, and confirmed our suspicions that he and his alter-ego Frank Reynolds are now essentially the same kooky person.

DeVito offered some scattered, vaguely sexual advice for Day to get the audience on his side, resulting in a short musical performance. Check that out above and also be sure to watch SNL's take on the Kardashian divorce and Rick Perry's "drunk" speech.