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

Julia Roberts
Age: 45
Occupation: Actress
Known For: Films such as 'Pretty Woman,' 'Steel Magnolias,' and 'My Best Friend's Wedding,' her Oscar-winning performance in 'Erin Brockovich,' being one of Hollywood's best-paid actresses, and her many past relationships with former co-stars

Bill Gates
Age: 57
Occupation: Business Magnate and Philanthropist
Known For: Co-founding Microsoft and formerly serving as its CEO, being one of the richest people in the world, his longtime rivalry with the late Apple co-founder Steve Jobs, and donating much of his wealth to charity through the Bill & Melinda Gates Foundation

Charlie Daniels
Age: 76
Occupation: Singer, Songwriter, and Musician
Known For: His contributions to country and southern rock music, including the number one country hit 'The Devil Went Down to Georgia' and other songs such as 'In America' and 'Drinkin' My Baby Goodbye,' and being inducted into the Grand Ole Opry in 2008

Bruce Jenner
Age: 63
Occupation: Television Personality and Former Athlete
Known For: Winning the gold medal for decathlon in the Montreal 1976 Summer Olympics, his marriage to the former Kris Kardashian, being the step-father to her seemingly endless supply of reality-star offspring, and appearing on their show 'Keeping Up with the Kardashians'

Joaquin Phoenix
Age: 38
Occupation: Actor
Known For: His two Academy Award nominations for his work in the films 'Gladiator' and 'Walk the Line,' being an animal-rights activist, and the bizarre 2010 "mockumentary" he made with Casey Affleck, 'I'm Still Here'