It's been almost four years since SEAN HAYES was on the show, and he's back today! The funnyman will update everyone on what he's been doing since "Will & Grace." Hopefully, it involved a lot of relaxation, because he's going to Broadway to star in "Promises, Promises" with Kristin Chenoweth. Ellen starred in a musical with Kristin too -- it was called "Ellen: The Musical." Today she'll leave the music to a professional -- specifically INGRID MICHAELSON, who has performed with one of Ellen's favorite musicians, Joshua Radin, and opened for Jason Mraz. Now she's coming here to perform her hit song, "Maybe."