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

Billy Bob Thornton
Age: 57
Occupation: Actor, Screenwriter and Musician
Known For: Winning an Oscar for writing the screenplay for 'Sling Blade,' roles in that film and in others like 'A Simple Plan,' 'Armageddon,' 'Monster's Ball,' 'Friday Night Lights' and 'Bad Santa,' and a short-lived and bizarre marriage to Angelina Jolie

President Barack Obama
Age: 51
Occupation: Politician and Frequent Punching Bag
Known For: Currently serving as the 44th president of the United States, being the first African-American to hold the office, and his unshakably cool public persona in the face of countless attacks

Richard Belzer
Age: 68
Occupation: Actor
Known For: Playing Det. John Munch on both 'Homicide: Life on the Street' and 'Law & Order: SVU,' earlier work as the audience warm-up comedian for 'Saturday Night Live,' and winning a 1985 court settlement after he stupidly asked Hulk Hogan to put him in a choke-hold and the wrestler acquiesced and injured him in the process

Daniel Dae Kim
Age: 44
Occupation: Actor
Known For: Playing Jin-Soo Kwon on 'Lost' and Chin Ho Kelly on 'Hawaii Five-0,' voicing Johnny Gat in the Saints Row video game series, and movie roles in 'Spider-Man 2' and 'Crash'

Tom Parker
Age: 24
Occupation: Singer
Known For: Being a member of the currently-hot British boy band The Wanted, who are famous for the hit song 'Glad You Came,' the ear-piercing shrieks of their fans, and for infamously calling Christina Aguilera a nasty name after she apparently snubbed them when they appeared on 'The Voice'