Blake Lively

"Gossip Girl" star Blake Lively turns 25 on August 25. (credit: Jason Kempin/Getty Images)

Blake Lively

Blake Lively shown here at the world premiere of "Savages" last month. (credit: Joe Klamar/Getty Images)

Rachel Bilson

"Heart of a Dixie" star Rachel Bilson's will turn 31 on August 25. (credit: Frederick M.Brown/Getty Images)

Rachel Bilson

"Heart of a Dixie" star Rachel Bilson shown here at the 2012 CW upfront in New York City.

Mamie Gummer

Emily Owens M.D. Star Mamie Gummer will turn 31 on August 3. (credit: Frederick M. Brown/Getty Images)

Mamie Gummer

Mamie Gummer shown here at the 2012 CW Upfront in New York City. (credits: Michael Loccisano/Getty Images)

Nicole Gale-Anderson

"Beauty and the Beast" star Nicole Gale-Anderson will turn 22 on August 29. (credits: Frederick M. Brown/Getty Images)

Nicole Gale-Anderson

Nicole shown here at the premiere of Summit Entertainment's "Bandslam" in August of 2009. (credit: David Livingston/Getty Images)

Jay Ryan

Jay Ryan star of CW's new show "Beauty and the Beast" will turn 31 on August 29. (credit: Kevin Winter/Getty Images)

Jay Ryan

Jay Ryan speaks at the 2012 CW tour in Beverly Hills,CA. (credit: Frederick M. Brown/Getty Images)

Michael Rady

Emily Owens M.D. star Michael Rady will turn 31 on August 20. (credit: Mike Davis/Getty Images)

Michael Rady

Michael Rady shown here in 2009 at the "Melrose Place" premiere party. (credit: Jason Merritt/Getty Images)

Austin Butler

Austin Butler star of CW'S newest show "The Carrie Diaries" turns 21 on August 17. (credit: Jesse Grant/Getty Images)

Austin Butler

Austin Butler shown here with girlfriend Vanessa Hudgen's at the premiere of "Journey 2" this past winter in LA. (credit: Jason Merritt/Getty Images)