Spears walks the line between glamorous and sweet and sexy in the pictorial, which features her two sons with ex-hubby Kevin Federline, Preston, 4, and Jayden, 3.
In one photo, she peeks out from under the covers of a fluffy bed and in another she props herself on the kitchen counter as one of her sons plays in mess of cupcakes and frosting.
In her real life, things are going swimmingly for the singer, who recently wrapped the Australian leg of her Circus tour. While sources shot down rumors of an engagement to boyfriend Jason Trawick, the couple are "very happy," a source tells PEOPLE. And besides spending her birthday with her favorite boys, Spears got an extra special B-day gift: A Grammy nomination for best dance recording.
For more photos of Spears – and all the dish on her relationship with Jason Trawick – pick up PEOPLE on newsstands Friday
Carter Smith / Elle Magazine