Here are some of the celebrities who are celebrating their 40th birthday this year,

LL Cool J, American rapper and actor (January 14)
Sarah McLachlan, Canadian singer (January 28)
Lisa Marie Presley, American singer (February 1)
Molly Ringwald, American actress (February 18)
Daniel Craig, British actor (March 2)
Céline Dion, Canadian singer (March 30)
Patricia Arquette, American actress (April 8)
Anthony Michael Hall, American actor (April 14)
Ashley Judd, American actress (April 19)
Kylie Minogue, Australian singer (May 28)
Gillian Anderson, American actress (August 9)
Rachael Ray, American television chef (August 25)
Will Smith, American rapper and actor (September 25)
Naomi Watts, English-born actress (September 28)
Hugh Jackman, Australian actor (October 12)
Shaggy, Jamaican singer (October 22)
Vanilla Ice, American rapper (October 31)
Lucy Liu, American actress (December 2)
Margaret Cho, Korean-American comedian (December 5)

See a more complete list of celebs turning 40 in 2008 at a site appealing especially to all the people who are turning 40 this year - Turning40.net.

The photos above are of Racheal Ray, Naomi Watts and Kylie Minogue.