Celebrity Mound

Ashlee Simpson and Pete Wentz are expecting a baby boy, a rep from the baby boutique Petit Tresor tells CelebTV.com exclusively.

The couple, who married in May, filled out a registry for their baby in June and our source says, “almost everything is blue.”

A salesperson who helped the couple said, “They [Simpson and Wentz] made it very clear that it was a boy.”

On June 30, the rocker couple bought a few T-shirts and bibs from Plain Mary with the words, “Hunk,” “Loved” and “Yummy” emblazoned on the front. The shirts retail for $28 and the bibs for $18.

Simpson and Wentz will visit the baby boutique next week to discuss the nursery, our source confirms.

Simpson’s rep did not immediately return our call for comment.

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Pregnant singer Ashlee Simpson’s summer tour is on hold.

“After careful consideration, Ashlee Simpson has decided to postpone her summer tour,” her rep said in a statement. “She is committed to giving her fans the best show possible, and will be back better than ever and ready to rock in the future.”

On Thursday, the 23-year-old confirmed that she’s expecting her first child with husband Pete Wentz, 28. Usmagazine.com first broke the news in April.

The couple hit the opening of the Palms Place Hotel & Spa in Las Vegas with Jessica Simpson (sans on-again, off-again beau Tony Romo) on Saturday night.

At the end of his stint as DJ, Wentz gave a shout-out to his “baby mama.” He also decided the Huey Lewis song “Power of Love” to his father-in-law, who was at the party with wife Tina.

“Yo, yo yo! This goes out to Joe Simpson, my new father-in-law,” he told the crowd. “I feel the power of love for you and everyone else should too.”

Wentz also played his wife’s song “In My Head.”

This week Wentz apologized to MTV for keeping their pregnancy news under wraps.

“We wanted to wait until after the first trimester and get a clean bill of health from our doctors before confirming anything, just like any other couple,” he emailed MTV.com.

“Being a boy I have no idea how to respond to such things and my first instinct was to protect her and the baby,” he added. “I apologize to anyone who felt misinformed but the truth is, the person and growing baby is who I felt most loyal to protect and defend.”

After weeks of speculation, Ashlee Wentz (nee Simpson) and her husband, Pete, confirmed they are indeed expecting a baby. The announcement was made on Pete’s blog, and said, “While many have speculated about this, we wanted to wait until after the first trimester to officially confirm we are expecting our first child …”

While some think the couple was just waiting until, say, they were married, some sources close to the couple say that the baby was blogged about because none of the weeklies wanted to run an exclusive (i.e., pay for photos) for a big story about the couple’s bundle-of-joy-to-be. “Their wedding story didn’t do well on newsstands, so everyone passed on the baby story. And of course, it wasn’t like it was news (that they were expecting) anyway,” said a source close to the couple.

In unrelated Wentz news, Pete and Ashlee are shopping around a reality show, according to a source who spoke to OK! magazine. While rumors of a reality show have been reported previously, this source shed some light on the show itself, namely that that Ashlee channels her inner Jessica Simpson and dumbs herself down, at least in the footage that’s been presented to television outlets.

“One scene is at a dinner and everyone is toasting to business ventures and important things like that,” the source told the magazine. “But when it came to Ashlee, she toasted ‘to jewelry,’ and Pete just shook his head.”

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Newly married Ashlee Simpson is changing her name to Ashlee Wentz in honor of her husband, Fall Out Boy Pete Wentz.

“I think that that’s something that a woman should do when they’re marrying a man,” she tells PEOPLE. “It’s a tradition that I think is a great tradition.”

The singer, whose May 17 wedding featured an Alice in Wonderland-themed reception, says that privately she’ll go by Ashlee Wentz and professionally she’ll be Ashlee Simpson-Wentz.

Pete Wentz says he left the name change decision to his wife. “These decisions with Ashlee and her name are all completely up to Ashlee,” Wentz says. “I want her to do these kinds of things the way she wants to do them.”

Still, he admits, he was flattered. “Oh man, I was like upgrade me! You know what I’m saying? The Wentz family, our Christmas card just got upgraded!” he says. “It feels insane. It feels unreal.”

Ashlee Simpson and Pete Wentz will wed Saturday, May 17 at a “top secret” location, a source close to the couple told Usmagazine.com.

“Proper invites have not been sent out but instead guests have been given a save the date notice,” the source told Us.

The rehearsal dinner – described by the source as “an intimate affair” for “family and close friends only” – will take place on Friday.

On Saturday, “all guests will be transported in shuttles to the wedding location,” the source explained.

Simpson, 23, and Wentz, 28, announced their engagement in April.