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

Olivia Newton-John
Age: 64
Occupation: Singer, Songwriter, and Actress
Known For: Winning four Grammy Awards for songs such as 'I Honestly Love You' and 'Physical,' starring in the smash movie musical 'Grease,' being a breast cancer survivor, and her work as an environmental and animal rights activist

Bryan Ferry
Age: 67
Occupation: Singer and Songwriter
Known For: Singing lead for Roxy Music on songs such as 'More Than This' and 'Avalon'

Linda Hamilton
Age: 56
Occupation: Actress
Known For: Her portrayal of Sarah Connor in 'The Terminator' and its sequel, 'Terminator 2: Judgment Day,' and roles in TV shows such as 'Beauty and the Beast' and 'Chuck'

Serena Williams
Age: 31
Occupation: Professional Tennis Player
Known For: Being ranked the number one female player on five separate occasions, winning 27 Grand Slam titles, earning more career prize money than any other female athlete in history, and being the sister of fellow player Venus Williams

Christina Milian
Age: 31
Occupation: Singer and Actress
Known For: Songs such as 'AM to PM,' 'Dip It Low,' and 'Say I,' roles in 'Ghosts of Girlfriends Past' and 'Bring It On: Fight to the Finish,' and her former marriage to rap star The Dream

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