Last night's 'Extreme Makeover' profiled Clara and her daughter, Cynthia, who run a daycare center that provides for children in their Pennsylvania neighborhood.

Their open hearts and open doors caught the attention of both the show and singer Mary J. Blige, who paid a special visit in the episode.

Watch this extremely heartwarming scene from 'Extreme Makeover' after the jump.

Alan Alda returns as Jack Donaghy's dad tonight on 30 Rock for the show's season finale, "Kidney Now." The plot finds Jack trying to put together a benefit concert for Alda, who is in need of a kidney. That, of course, means the ep will be loaded with appearances by famous musicians.

Guest stars include Elvis Costello, Mary J. Blige, Sheryl Crow, Maroon 5's Adam Levine and Clay Aiken. The clip below reveals some shocking truths about some of these famous crooners, including Aiken's relation to NBC page Kenneth Parcell.

May sweeps has officially arrived. For TV fans that means a full month of explosive season finales, jaw-dropping cliffhangers and -- best of all -- a long list of famous guest stars from both the big and small screens.

Among the A-listers you'll see this season: a daytime TV queen (Elisabeth Hasselbeck), a 'Star Trek' icon (Leonard Nimoy) and a two-time Oscar winner (Jodie Foster) who will finally let Maggie Simpson do the talking.

Check out our guest stars gallery to see when all of Hollywood's finest will be sweeping their way onto your favorite TV shows.