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

Bill Cosby
Age: 74
Occupation: Comedian, Actor, and Living Legend
Known For: Producing and/or starring in many TV series including the groundbreaking '80s sitcom 'The Cosby Show,' winning slews of awards, and most recently weathering criticism for his outspoken views on race and culture

Richard Simmons
Age: 63
Occupation: Fitness Personality
Known For: His eccentric, flamboyant persona and his line of Sweatin' to the Oldies aerobics DVDs

Christine McVie
Age: 68
Occupation: Singer, Songwriter, and Musician
Known For: Being part of the iconic rock group Fleetwood Mac for which she wrote and/or sang lead vocals on songs such as 'Over My Head,' 'Don't Stop,' 'You Make Lovin' Fun' and 'Songbird'

Cheryl Ladd
Age: 60
Occupation: Actress
Known For: Playing Kris Munroe for five years on the TV show 'Charlie's Angels'

Kristi Yamaguchi
Age: 40
Occupation: Figure Skater
Known For: Winning two world championships, a gold medal at the 1992 Winter Olympic Games, and the sixth season of 'Dancing with the Stars'