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Christina Aguilera is "amazed" by her ever-expanding boobs.

The new mom gave birth on January 12 to son Max, her first child with husband Jordan Bratman and was shocked by how much weight she gained during the pregnancy, but was delighted when her breasts got bigger.

"I was just amazed by the whole process of being pregnant. It's unbelievable to see yourself grow like that. So my stomach was huge back then, and now my chest is huge," Aguilera said.

'To see the product of your love together is just incredible my husband and I just can't stop staring at him," she said.

The 27-year-old said the thing she dislikes about being a new mom is being so confined to her house.

Aguilera told TV host Ellen DeGeneres, 'I'm very into the four walls of my bedroom and Max's nursery right now. As soon as I leave the house, it's like, 'The outside world!' "