Fergie may have given birth a few months ago, but the Black Eyed Peas singer has jumped back into shape.

The star flaunted her toned body and showed ample cleavage in a new Instagram photo. In the picture, Fergie sports a black and shiny one-piece jumpsuit as well as a green coat. 

"Had fun at Studio 54 last night! Happy New Year everyone!!!!! #2014," she captioned the Jan. 1 shot.

To lose her baby weight, Fergie revealed her special workout routine when she visited The Ellen DeGeneres Show in November.

"I'm trying. I'm slowly getting back into it," she said about getting her pre-baby body back. "I'm doing some belly dancing yoga."

The singer and her husband/actor Josh Duhamel welcomed 7 pound 10 ounce Axl Jack on Aug. 29.

Fergie broke the news via Twitter in February that she and her husband of four years were expecting their first child.

"Josh & Me & BABY makes three!!! #mylovelybabybump," the singer tweeted, along with a photo of herself and her husband as children.

Scroll through the gallery above to see photos of Fergie before and after pregnancy.