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

Martin Sheen
Age: 71
Occupation: Actor and Activist
Known For: Roles in films such as 'Apocalypse Now,' his nuanced portrayal of President Bartlet on the great TV drama 'The West Wing,' and being the father of the downward-spiraling Charlie Sheen

Martha Stewart
Age: 70
Occupation: Entrepreneur and Media Personality
Known For: Her syndicated talk show, 'Martha,' her magazine, 'Martha Stewart Living,' and serving what many felt was an unfair prison sentence for lying to investigators about a stock sale

Tony Bennett
Age: 85
Occupation: Singer
Known For: His signature song, 'I Left My Heart in San Francisco,' and a remarkable career resurgence that began in the late 1980s

James Hetfield
Age: 48
Occupation: Singer, Songwriter, and Musician
Known For: Co-founding the band Metallica, singing on songs such as 'Enter Sandman' and 'The Unforgiven,' and alienating himself from many fans when he had a well-publicized legal battle with music-sharing service Napster

Tom Brady
Age: 34
Occupation: Professional Football Player
Known For: Winning three Super Bowls as quarterback for the New England Patriots, his marriage to supermodel Gisele Bundchen, and generally leading a charmed existence