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

Tracy Morgan
Age: 44
Occupation: Actor and Comedian
Known For: Eight seasons as a cast member on 'Saturday Night Live,' and his current role as Tracy Jordan on the NBC series '30 Rock'

Miranda Lambert
Age: 29
Occupation: Singer, Songwriter and Musician
Known For: Rising to fame as a finalist on the 2003 season of 'Nashville Star,' her number one country hits 'The House That Built Me' and 'Heart Like Mine,' and her recent marriage to fellow country singer Blake Shelton

Tim Rice
Age: 68
Occupation: Lyricist
Known For: His award-winning collaborations with people such as Andrew Lloyd Webber on 'Joseph and the Amazing Technicolor Dreamcoat,' 'Jesus Christ Superstar' and 'Evita'; his work on 'Aladdin' and 'Beauty and the Beast' for Walt Disney Studios with Alan Menken; and working on 'The Lion King' and 'Aida' with Elton John

Mackenzie Phillips
Age: 53
Occupation: Actress
Known For: Her roles in the film 'American Graffiti' and as rebellious teenager Julie Cooper on the sitcom 'One Day at a Time,' a long history of substance abuse, and her creepy 2009 memoir in which she said she had a decade-long affair with her own father

Ellen Pompeo
Age: 43
Occupation: Actress
Known For: Playing the title role of Meredith Grey on the ABC medical drama 'Grey's Anatomy'