Mariah Carey by Jim Spellman/WireImage.com and Janet Jackson by Jeffrey Mayer/WireImage.com Mariah Carey by Jim Spellman/WireImage.com and Janet Jackson by Jeffrey Mayer/WireImage.com
Janet Jackson has bowed out of her scheduled appearance as the musical guest on this weekend's

Saturday Night Live, due to an illness. "Janet did go to the hospital [Monday] night due to the fact she's been suffering from this flu that's kicked a lot of people's behinds," the singer's rep tells the Associated Press. "She was never admitted and she is fine." Not fine enough, though, to join host Jonah Hill on the March 15 telecast. "She needs some time to get better," says the rep. On Wednesday, it was announced that Mariah Carey will step in and serve as musical guest. Kenneth the NBC page will be so happy! Related: " Watch Video: Mariah Carey Spanks 30 Rock Nerd " How "Kenneth" Came to 30 Rock Mariah's World " Mariah Carey Among the Stars to Help Idol Give Back