CELEBRITY BIRTHDAYS (8/24/11): Rupert Grint - 23 Harry’s red-headed buddy, Ron Weasley, in the "Harry Potter" movies. L to R, Rupert ten years ago when the first 'Potter' movie came out and today ...

 PEEP THIS: The “Harry Potter” Kids Then and Now [PHOTOS]

--Alex O'Loughlin - 35  The new Steve McGarrett in the new "Hawaii Five-0" ...

--Chad Michael Murray - 30  He was Lucas on "One Tree Hill" ...

--Marlee Matlin - 46 The youngest woman and the only deaf actress to date to win the Academy Award for Best Actress. Matlin was a contestant in the sixth season of "Dancing with the Stars", coming in 7th, and a finalist on the last "Celebrity Apprentice". She lost the finale to John Rich.

WATCH: Billy Joel And Marlee Matlin Sing 'Just The Way You Are' to Oscar the Grouch ...

--David Koechner - 49 Very popular character actor you may have seen on "Anchorman" and "The 40-Year-Old Virgin." He's also Todd Packer on "The Office". Currently in "Final Destination 5" ...

--Dave Chappelle 38  The comedian and actor appeared in several movies like "You've Got Mail" and "Undercover Brother". He's best-known as the host of his own Comedy Central show, "Chappelle's Show", where he played such memorable characters as Rick James and Prince ...

--Steve Guttenberg - 53 "Police Academy" and "Three Men and a Baby" superstar. Last seen in the 2008 spring season of "Dancing with the Stars" ...

WATCH: Guttenberg was one of many celebrities who appeared in the 1989 Michael Jackson music video, "Liberian Girl" ...