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

Robin Williams
Age: 61
Occupation: Actor and Comedian
Known For: Starring on the sitcom 'Mork and Mindy,' his Oscar-winning role in 'Good Will Hunting,' nominations for other movies like 'Good Morning, Vietnam' and 'Dead Poets Society,' and his voiceover work in 'Aladdin' and the 'Happy Feet' franchise

Josh Hartnett
Age: 34
Occupation: Actor
Known For: Playing Michael Fitzgerald on the television series 'Cracker,' starring in movies such as 'The Virgin Suicides,' 'Pearl Harbor,' 'Black Hawk Down' and '40 Days and 40 Nights,' and being the first male celebrity to represent Giorgio Armani Beauty

Cat Stevens
Age: 64
Occupation: Singer, Songwriter and Activist
Known For: Hits such as 'Wild World,' 'Peace Train,' 'Morning Has Broken' and 'Oh Very Young,' writing songs like 'The First Cut Is the Deepest' for other artists, and later converting to Islam and changing his name to Yusuf Islam

Garry Trudeau
Age: 64
Occupation: Cartoonist
Known For: Drawing the popular 'Doonesbury' syndicated comic strip, being the first cartoonist to win a Pulitzer, and his longtime marriage to TV journalist Jane Pauley

Jon Lovitz
Age: 55
Occupation: Actor and Comedian
Known For: Five seasons on 'Saturday Night Live,' numerous movie and TV roles, voiceover work on the animated show 'The Critic,' and his blowhard opinions about politics

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