Here's a look at some notable birthdays being celebrated today:

Maggie Gyllenhaal
Age: 35
Occupation: Actress
Known For: Movies such as 'Secretary,' 'Sherrybaby,' and 'The Dark Knight,' her Oscar-nominated role in 'Crazy Heart,' her longtime relationship with actor Peter Sarsgaard, and being the older sister of Jake Gyllenhaal

Marg Helgenberger
Age: 54
Occupation: Actress
Known For: Playing Catherine Willows on 'CSI: Crime Scene Investigation' and her Emmy-winning role as K.C. Koloski in the 1990s ABC drama 'China Beach'

Diana Krall
Age: 48
Occupation: Singer, Songwriter and Musician
Known For: Being the only jazz singer to have eight albums debut at the top of the Billboard Jazz charts; winning three Grammys; earning nine gold, three platinum and seven multi-platinum albums; and her marriage to fellow singer Elvis Costello

Dean McDermott
Age: 46
Occupation: Actor and Reality Show Star
Known For: His marriage to '90210' star Tori Spelling, with whom he's appeared on the shows 'Tori & Dean: Inn Love' and 'Tori & Dean: Home Sweet Hollywood'

Lisa Bonet
Age: 45
Occupation: Actress
Known For: Her role as Bill Cosby's daughter Denise Huxtable on the groundbreaking NBC sitcom 'The Cosby Show'; originally starring in its spin-off, 'A Different World'; and her former marriage to rock star Lenny Kravitz