Jason Segel with Kermit the Frog and Miss Piggy in a scene from "The Muppets." (Andrew Macpherson/AP)

Kermit the Frog, Miss Piggy and a few other “The Muppets” Muppets joined the actor for his opening monologue, a ditty called, “I Can’t Believe I’m Hosting ‘SNL.’”

Kermit also joined Seth Meyers for his “Really?” segment, trading outraged comments about Congress’s declaration that pizza is a vegetable. (According to the WonkBlog’s Sarah Kliff, this isn’t exactly the full story.)

Segel’s “I Love You Man” co-star, Paul Rudd, also made a surprise appearance, showing his love for the first time host in the form of a big, sloppy kiss. Watch these moments below.