Sia celebrates her 42nd birthday today. The singer was born in Adelaide, Australia in 1975. Brad Pitt turns 54 on December 18th. The Ocean’s Eleven star was born in Shawnee, Oklahoma in 1963. Christina Aguilera is 37 today. The singer was born in 1980 in New York, City. Katie Holmes is 39 today. The Dawson’s Creek star was born in 1978 in Toledo, Ohio. Happy Birthday!!
