Gabrielle Union Flaunts Cleavage in Sexy Black Jumpsuit at 40th Birthday Party

Gabrielle Union attends her 40th Birthday Party With Courvoisier Gold at PH-D Rooftop Lounge at Dres Downtown on October 22, 2012 in New York City.  Jerritt Clark/Getty Images for Courvoisier

This is 40, indeed.

Actress Gabrielle Union feted the big 4-0 in NYC Monday night, looking hardly a day older than she did when she appeared 1999's 10 Things I Hate About You and 2000's Bring It On.

PHOTOS: Celebs who love athletes

The gorgeous Think Like a Man star wore her hair sleek and long, and showed off her slim figure in a sexy black jumpsuit boasting a deep v neckline.

For her birthday bash, Union and a group of close friends enjoyed a private dinner at Big Apple hotspot Marble Lane, located inside the Dream Downtown Hotel. Revelers noshed on a mixed green salad, wood grilled filet mignon and a Rocky Mountain Devil's Food Cake, all cooked by Chef Roble.

Union has spoken before about how she maintains her ageless figure — mostly via trips to the gym (often alongside her Miami Heat star boyfriend, Dwyane Wade). Occasionally, though, she mixes it up with a new, slightly more extreme workout.

For example? Union opened up to Us Weekly earlier this month about giving boxing a try.

"It sucked. To sum it up," she joked. "It's incredibly hard and every inch of my body was in pain. And they can hit you back! I didn't get that memo."

Added the star, "Getting walloped in the face is never a good thing."

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!