H'wood Party Girl

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The night Ashlee Simpson-Wentz got booted off Melrose Place, she was busy playing her most important role: mommy!

"She's home with Bronx," Pete Wentz explained of Ashlee's absence from last night's Guess? and Vanity Fair party for the Invisible Children charity.

"He has a 101-degree fever. We're just glad it's not swine flu!" he continued.

The freshly shorn rocker was a cohost at the charity fête along with Kristen Bell and Rachel Bilson—which sort of explains why he wasn't home tucking Bronx into bed or consoling his suddenly unemployed wife. Only that wasn't the only party he hit last night...

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For Fashion's Night Out, New York City had Victoria Beckham, Charlize Theron and Justin Timberlake, while Hollywood got Ashlee Simpson and Pete Wentz.

Hey, we'll take what we can we get.

Ash and Pete left baby Bronx home for the night when they hit Ron Herman at Fred Segal to hang with fans and score some J Brand jeans. 

"They were so cute together and looked really happy," says an eyewitness.

Despite the crowd and cameras, the couple even engaged in some PDA...

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Nicole Richie is already a mom and designer, but last night, she was moonlighting as a publicist!

Nic cohosted a fashion show along with Pete Wentz and made sure he didn't answer any questions about the alleged fight Ashlee Simpson-Wentz and Michelle Trachtenberg got into over him.

"That's not appropriate," she interrupted when I asked about ladies fighting over him.

As for whether he gave the models clad in his Clandestine Industries clothing any advice?

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If you're a Nicole Richie fan and live near L.A., the countdown is on to win tickets to her fashion show tonight.

She's hosting a party at Boulevard 3, where models will hit the catwalk in jewels from her House of Harlow line and threads from Clandestine Industries, Pete Wentz's clothing line.

The bash will also be filmed for the MTV series Styl'd. So how can you get your hands on the tickets?

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Did Ashlee Simpson-Wentz and Michelle Trachtenberg practically throw down over Pete Wentz at a star-studded Hollywood soiree?

Don't believe the hype—or, in this case, the Perez Hilton dramarama version.

Yes, the girls were seated in the same VIP section at Monday's DJ Hero event, where Eminem and Jay-Z performed. In fact, a source tells E! News, the two had been chatting cordially earlier in the evening.

Then, per our partygoing pal, Ash "definitely had one drink too many."

But while Perez says that a tipsy Ashlee ended up verbally attacking Michelle (accompanied by a new beau) about her dating Pete Wentz, we've learned things weren't that serious.

As Ashlee's rep spins it...

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While Ashlee Simpon Wentz's been twittering about how much she misses hubby Pete Wentz while he's touring, he's been partying like a rock star on tour.

After Fall Out Boy's sold-out show at the Palms Sunday night, Pete got down with some scantily clad dancers until the early morning at a Vegas afterparty.

Ashlee, who's back home in L.A., has been keeping herself busy posting adorable pics of baby Bronx on her Twitter.

"Bx and I miss you so much," she tweeted on Tuesday night. "We are only the 2 amigo's without you. Last night I wanted a snuggle fest with you. Miss you mucho."

Although Pete is scheduled to play shows in Portland and Seattle next, it sounds like the whole family will be back together come Sunday.

"This is going to be the best Easter EVER!!" she tweeted to Pete.

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Ashlee and Pete Wentz's baby, Bronx Mowgli, is doing just fine.

After Ashlee canceled an appearance at the Eleven Spa Vegas party Wednesday, rumors flew that she stayed home because Bronx had broken his arm.

"It's not true," her rep said, adding that Ash was planning to attend but canceled due to scheduling issues. "Everyone is fine."

Instead of hitting the soiree in Sin City, where Eva Longoria Parker and Mario Lopez were hanging, Ash opted to stay local and grab sushi at Nobu with her girlfriends.

Also at the restaurant in Los Angeles, Brandy Norwood celebrating her birthday with brother Ray J, Lil' Kim and Diddy in attendance.

Frank Micelotta/Getty Images for MTV

Ashlee Simpson-Wentz and Pete Wentz just became parents to Bronx Mowgli last week, but it looks like their social schedule is already busy.

The proud mom and dad will host a New Year's Eve party at Pure in Las Vegas, leading the clubgoers on a countdown to midnight, it's just been announced.

Wonder if they'll bring baby Bronx along with them for their Sin City trip? Or will grandparents Joe and Tina be on babysitting duty since we assume aunt Jessica will be off somewhere kissing Tony Romo at midnight.

What do you think—is it too soon for the new parents to be hosting parties, or will the sound of slot machines sooth the baby? Sound off below!