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

Colin Firth
Age: 52
Occupation: Actor
Known For: Winning an Academy Award for his portrayal of King George VI in 'The King's Speech,' and the lucky man who gets the deliciously chubby Renee Zellweger at the end of 'Bridget Jones' Diary'

Ryan Phillippe
Age: 38
Occupation: Actor
Known For: Movies such as 'I Know What You Did Last Summer,' 'Cruel Intentions,' and 'Crash,' and a previous marriage to actress Reese Witherspoon

Guy Ritchie
Age: 44
Occupation: Screenwriter and Director
Known For: Directing 'Lock, Stock and Two Smoking Barrels,' and 'Sherlock Holmes,' and escaping an eight-year marriage to Madonna with his manparts miraculously intact

Joe Perry
Age: 62
Occupation: Rock Star
Known For: Playing lead guitar for the rock band Aerosmith

Bill O'Reilly
Age: 63
Occupation: Television Personality
Known For: Hosting the political commentary program that bears his name, 'The O'Reilly Factor,' on the Fox News Channel