Christina Aguilera with Ellen DeGeneres
Ellen to Christina Aguilera: 'Are You Nursing?' | Christina Aguilera
This week's PEOPLE cover subject Christina Aguilera is happy to chat about motherhood – every aspect of her new role, in fact. During an appearance on The Ellen DeGeneres Show scheduled to air Wednesday, the talk-show host playfully asks the pop star – who sported a low-cut shirt – "You look great. One question: Are you nursing?"

A blushing Aguilera responded: "I guess it's a little obvious," and DeGeneres quipped back, "It's going to be a healthy baby boy." (Watch the clip here.)

Aguilera, 27, did not demure when talked turned to her son's Bris. "We are not a very conservative couple," she told DeGeneres. "For decorations we put up penis balloons all over the place. It was really fun, it was really great." A stunned Ellen replied: "Really, they have penis balloons in a shop ... you can just buy them?"

Exclusive: At Home with Christina and Baby