Ashlee left the baby at home and took her new blond extensions and her hubby Pete Wentz to PURE in Las Vegas, where she downed champagne and partied the night away to ring in 2009.

She’s lost a lot of the baby weight, but you can tell she’s still being careful to cover up her arms and her tummy. Which is totally fine by me! It’s such a relief to find a celebrity who’s actually human and doesn’t lose the entirety of her baby weight in twelve days. That shit’s insane anyway.

Ashlee Simpson Talks Bronx Mowgli

It’s been an incredible month for Ashlee Simpson since the birth of her son Bronx Mowgli back on November 20th. And while hosting a New Year’s Eve party at PURE nightclub in Vegas, she wasn’t afraid to let everyone know how much she loves her new son.

Speaking with the media, the “Pieces of Me” songstress revealed a very important first for her little guy- “He laughed for the first time. That was pretty exciting.”

Fully embracing her newfound motherhood, Ashlee told press that being Bronx’s mom is her first priority. “All my focus is on my son. Every day, being a better mom and learning with him. It’s an incredible experience.”

She’s also determined to shed her pregnancy pounds, and has already begun doing so. “I just started exercising again. It’s fun. I do it at my house.”

As for her aspirations in the New Year, Ashlee says that we’ll hopefully be hearing some new material in the not-too-distant future as she plans to “go back in the studio [to] start working. Not quite yet, but soon.”

Ashlee Simpson And Pete Wentz Party With Heidi Montag And Spencer Pratt