It looks like Fergie decided to take a break from baby Axl Jack and husband Josh Duhamel in order to shoot a sexy topless Instagram video for Calvin Klein.

In the video the 38-year-old mom wore a pair of Calvin Klein underwear as she rocked her hips to the background music while using her arms to cover her bare breasts.

The Black Eyed Peas singer then rolled around on the bed while giving a sultry look to the camera and swung her hair back and forth.

Attached to the video was the caption, "Boom. #mycalvins."

Fergie joins the list of celebrities who have endorsed the brand, such as Alexander Skarsgard, Rooney Mara, Trey Songz and Diane Kruger.

According to Just Jared, the brand has recently launched a social media movement that encourages people to post semi-nude selfies of their CK underwear which will be added to the official #mycalvins online gallery for the world to see.

Check out Fergie's Instagram video below.