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.

As the Academy Award presentation approaches, that can only mean one thing -- time for a new Barbara Walters special. Yes, yes, what matters most before the big show isn't the red carpet and the fashions, it's who will Barbara be interviewing for her annual Oscar edition? Ms. Walters has four biggies lined up for the Sunday, February 24th (7:00-8:00 p.m. ET) broadcast. Oscar nominee Ellen Page, star of Juno; Indiana Jones, himself, Harrison Ford; Ugly Betty diva, Vanessa Williams; and Hannah Montana/teen queen Miley Cyrus. It's an eclectic group, to say the least, but then, that's Baba Wawa's formula for success, is it not? After all, this is her 27th straight year doing a pre-Oscar special.