Pete Wentz’s favorite thing about wife Ashlee Simpson is her bustline.

“I would start with the breasts,” he joked when asked what feature he likes best about his significant other.

The Fall Out Boy rocker, who welcomed the arrival of son Bronx Mowgli with Ashlee last month, can’t get enough of her knockers, but he’s insistent that their marriage is based on more than just physical attraction.

“Ashlee is the kind of person that understands me in a way that other human beings don’t understand each other.”

“I would say that we fit together kind of like Lego pieces, and that’s how we’re able to communicate.”

Pete says Ashlee, 24, always puts him first.

“She’s always there for me, she always has my back no matter what. If I have to leave at 6am to go somewhere, she’s packing my bag for me. I’m like, ‘What are you doing up at 6am?’ and she’s packing my bag.”