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

Marg Helgenberger
Age: 53
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'

Maggie Gyllenhaal
Age: 34
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 dreamboat actor Jake Gyllenhaal

Diana Krall
Age: 47
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: 45
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: 44
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 spinoff 'A Different World,' and her former marriage to rock star Lenny Kravitz