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

Kevin Costner
Age: 57
Occupation: Actor, Director and Screenwriter
Known For: Winning two Oscars for 'Dances with Wolves,' acclaimed work in other films like 'Field of Dreams,' 'Bull Durham,' 'The Bodyguard,' 'Tin Cup' and 'The Untouchables,' and having tomatoes thrown at him after appearing in 'Waterworld' and 'The Postman'

Jason Segel
Age: 32
Occupation: Actor and Screenwriter
Known For: Movies like 'Forgetting Sarah Marshall,' 'Knocked Up,' 'Bad Teacher' and 'The Muppets,' and starring in the TV series 'Freaks and Geeks' and 'How I Met Your Mother'

Alison Arngrim
Age: 50
Occupation: Actress
Known For: Playing bratty Nellie Oleson on the television show 'Little House on the Prairie,' guesting on many other series like 'The Love Boat' and 'Fantasy Island,' and becoming an activist for AIDS awareness after her 'Little House' co-star and good friend Steve Tracy died of the disease

Jesse L. Martin
Age: 43
Occupation: Actor
Known For: Originating the role of Tom Collins in the Broadway theatrical production of 'Rent,' his portrayal of NYPD Detective Ed Green on the NBC drama series 'Law & Order,' and producing and starring in an upcoming biopic of soul great Marvin Gaye

Jonathan Davis
Age: 41
Occupation: Singer, Songwriter and Musician
Known For: The lead vocalist and frontman for the metal band Korn, who've had eight top five albums, sold 35 million records worldwide and won two Grammy Awards for the singles 'Freak on a Leash' and 'Here to Stay'