Washington, July 25 : Jennifer Lopez cut a giant chocolate cake that had a huge photo of herself on her 40th birthday.

She celebrated the special day with husband Marc Anthony and the crew of her new film `The Back-Up Plan' at the movie's New York City set, Us magazine reports.

The stunner was spotted toasting with champagne, wearing an off-the-shoulder top.

And she embraced crewmembers who gifted her a bouquet of white flowers.

She reportedly said, "Alex, make a toast!" to her costar Alex O''Loughlin in a video of the party.

To which he replied: "Happy birthday. Welcome back, baby! To Jennifer!"

The new romantic comedy will be her first film after she gave birth to twins Max and Emme in February 2008. (ANI)