April 21, 2007 06:00 AM

The Hollaback Girl is on the all-star guest list as American Idol hosts its two-night charity event. See which other stars will be doing their part, plus other events to watch for in the coming week:

SUNDAY, APRIL 22: A new crop of stars will attempt to lose those pesky pounds on VH1’s Celebrity Fit Club 5. American Idol‘s Kimberley Locke, Brady Bunch star Maureen McCormick, ’80s teen pop queen Tiffany, Dustin "Screech" Diamond and rapper Warren G are fighting the battle of the bulge. And this time around, it’s a good old-fashioned war between the men and the women to see who can get rid of that badonkadonk butt (9 p.m. ET).

TUESDAY, APRIL 24: Now that Sanjaya is gone, it’s down to the Top 6 on American Idol. And the new six-pack will help kick off Idol Gives Back, the show’s two-night humanitarian effort aimed at raising awareness and money for organizations benefiting children living in poverty in America and Africa. Idol mentor Gwen Stefani, Pink, Keira Knightley and Mr. Kazakhstan himself – Borat Sagdiyev (Sacha Baron Cohen) – are among the all-star guests. Money donated will go toward the nonprofit Charity Projects Entertainment Fund. Tune in and do your part (FOX, 8 p.m. ET on both nights).

WEDNESDAY, APRIL 25: Break out the popcorn and the hybrid limos, because it’s time to kick off New York City’s Tribeca Film Festival! The dean of green himself, Oscar winner – oh, and former Vice President – Al Gore, is hosting the opening-night gala and will present seven short films on the world’s climate crisis. If educational movies aren’t quite your style, no worries: Spider-Man 3 will have its U.S. premiere at the film fest on April 30. The Tribeca celluloid fun continues until May 6.

THURSDAY, APRIL 26: Set your TiVo: After six weeks at home recovering from heart surgery, Regis Philbin returns to his cup of coffee and his rightful place beside Kelly Ripa on Live with Regis and Kelly (ABC, 9 a.m. ET). After weeks of guest hosts ranging from Survivor‘s Jeff Probst to Neil Patrick Harris, we’re ready for curmudgeonly Reege to reclaim to his daytime throne.

Movies (now in theaters): Fracture, starring Anthony Hopkins and Ryan Gosling; Vacancy, starring Luke Wilson and Kate Beckinsale; In the Land of Women, starring Meg Ryan and Adam Brody; The Tripper, starring Thomas Jane, Jaime King and Lukas Haas (limited); Hot Fuzz, starring Simon Pegg and Nick Frost; Stephanie Daley, starring Tilda Swinton and Amber Tamblyn (limited)
Music (in stores Tuesday): Arctic Monkeys, Favourite Worst Nightmare; Patti Smith, Twelve; Donny Osmond, Love Songs of the ’70s; John Prine & Mac Wiseman, Standard Songs for Average People; Bebel Gilberto, Momento; various artists, A Tribute to Joni Mitchell; Simply Red, Stay; Porcupine Tree, Fear of a Black Planet
DVDs (in stores Tuesday): The Queen; Night at the Museum; Deja Vu; Planet Earth: The Complete BBC Series; The Odd Couple: The First Season; One Day at a Time: The Complete First Season; WKRP in Cincinnati: The Complete First Season

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