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

Jenny McCarthy
Age: 40
Occupation: Model, Actress and Activist
Known For: Being 1993's Playmate of the Year, hosting the MTV game show 'Singled Out,' a long former relationship with Jim Carrey, and being an outspoken opponent of vaccines because she believes they can cause autism

Lyle Lovett
Age: 55
Occupation: Singer, Songwriter and Musician
Known For: An eclectic style that often fuses country, pop, and big band sounds, songs such as 'She's No Lady,' 'If I Had a Boat,' and 'Give Back My Heart,' his dry wit, a cult following, his big shock of hair, and a former marriage to actress Julia Roberts

Larry Flynt

Age: 70
Occupation: Publisher
Known For: Founding Larry Flynt Publications, which publishes 'Hustler' and produces other adult magazines and videos, several prominent legal battles involving the First Amendment, and being paralyzed from the waist down due to injuries sustained in a 1978 assassination attempt

Big Kenny
Age: 49
Occupation: Singer, Songwriter and Musician
Known For: Comprising half the country duo known as Big & Rich, which has charted 10 Billboard Country singles such as 'Save a Horse (Ride a Cowboy),' 'Holy Water,' and 'Lost in This Moment'

Penn Badgley
Age: 26
Occupation: Actor
Known For: His role as Dan Humphrey on the CW television series 'Gossip Girl,' and appearing in the movies 'John Tucker Must Die,' 'The Stepfather,' and 'Easy A'