Pete Wentz on marriage to Ashlee Simpson: "We have signed a pre-nup"

Pete Wentz wants to make sure the world knows he and new wife Ashlee Simpson have a pre-nup in place.

"We have signed a pre-nup," the Fall Out Boy rocker insisted.

Speaking to Ryan Seacrest on his KIIS-FM radio show Tuesday, Pete said Ashlee "legally is a Wentz ... I don't know what she'll do with her stage name, that's up to her. She hasn't decided that."

And he said their honeymoon plans are on hold for now; and they've been hanging out in their basement in L.A.

"We got some blow-up palm trees," Wentz said. "A little fake-n-bake tanning booth.

"We're eating DiGiorno's pizza, getting in that tanning oven every once in a while, it's great.

"It's gonna look like we're on that private jet," he added. "We're gonna save that 30 grand, you know?"

And how's he enjoying married life? "I feel great!" he said. "It is sunny and 65 in my head."

And dodging questions about Ashlee's widely reported pregnancy, Pete explained why the pair decided to get married when they did. "I get the backdoor question you're asking me, but it's been something we've been planning for a long time," he said. "I gave her a promise ring four months ago."

Seacrest later asked if he's thought about baby names.

"Ryan, this baby has not been confirmed," Wentz laughed. "The only thing I'm confirming now is that we're in the basement on our honeymoon with these blow-up palm trees."

He was also mum on rumors his sister-in-law, Jessica Simpson, split with Tony Romo.

"I don't know anything about what's going on with them," he said. "I'm so busy clearing up my own rumors!"