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,' another nomination for his role in 'A Single Man,' and appearing in other films such as 'Pride and Prejudice'

Ryan Phillippe
Age: 38
Occupation: Actor
Known For: Movies such as 'I Know What You Did Last Summer,' 'Cruel Intentions,' 'Crash,' and 'Stop-Loss,' and a previous marriage to actress Reese Witherspoon, with whom he has two children

Arnold Palmer
Age: 83
Occupation: Professional Golfer
Known For: Winning numerous events on both the PGA Tour and Champions Tour, being the first superstar of golf's television age, and being regarded as one of the greatest players in the history of the game

Karl Lagerfeld
Age: 79
Occupation: Fashion Designer
Known For: Helming his own label and that of Fendi, serving as head designer and creative director for Chanel, and being rather snotty and unpleasant

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