The new Judd Apatow comedy (and sort-of sequel to "Knocked Up") "This Is 40" is finally in theaters, showcasing the trials and tribulations of hitting that milestone birthday.

In Hollywood however, 40 is looking better than ever!

To celebrate the opening of the film, we've compiled forty of the best-looking 40-year-old celebs in town ... and clearly the year 1972 was great to mankind.

Sexy "Modern Family" star Sofia Vergara turned 40 on July 10. If only we could all look this good. Ay yi yi!

Mr. Golden Globe nominee Ben Affleck hit the big 4-0 on Aug. 15. Clearly his wife Jennifer Garner likes younger guys ... she turned 40 on April 17.

Forty years old and just recently posed for Playboy? Jenny McCarthy definitely has the body to do it! This sexy lady hit the milestone day on Nov. 1.

Anyone else jealous of Fergie? Her handsome hubby Josh Duhamel wears 40 well! His birthday was Nov. 14.

And the star of "This Is 40," Ms. Leslie Mann is using method acting for her role. This beauty turned 40 on March 26.

Click "Launch Gallery" above to see the rest of the hottest 40 year olds in town, many of whom may surprise you ... and/or make you feel really old.

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