With one swig of pink champagne at dinner Friday, Paris Hilton quickly put an end to any lingering pregnancy rumors that have been heating up the Web.

The heiress imbibed and dined with her “BFFs” while filming her new MTV reality show, Paris Hilton’s My New BFF, at Tao Las Vegas.

Still, even surrounded by girls vying for her attention, Hilton had one guy on her mind. Wearing a form-fitting, vintage black dress (with a belt wrapped firmly around her stomach), Hilton told PEOPLE that her boyfriend of nearly four months, Benji Madden, is her “best boyfriend”.

Madden, who was on hand wearing black shades, stood back most of the night, along with sister Nicky Hilton and boyfriend David Katzenberg, as his girl took the spotlight.

Following dinner, Hilton and the girls headed to Tao nightclub where the star of the show was greeted with her song “Stars Are Blind.” For the next two hours Hilton smoked cigarettes and danced with the seven remaining contestants on the club’s catwalk, all while cameras rolled.

And the partying wasn’t done after Tao, with the group heading to the exclusive Mirage villas for an afterparty where they were entertained by Las Vegas showman and Paris friend Jeff Beacher.

At the party, Hilton did more to confirm her non-pregnancy by gulping Grey Goose and Patron Silver tequila before she and Madden headed back to their suite at The Venetian.

“She’s clearly not pregnant,” said a guest at the afterparty.

By Mark Gray

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Always one to keep the public talking, Paris_Hilton showed up to talk about her new hair extension line with Sally Beauty Supply wearing a notable new accessory: a two-banded diamond ring on that finger.

Asked if the baubles were an engagement ring from boyfriend Benji Madden, Hilton told PEOPLE, “No, it’s just a present. He’s sweet.”

Still, the duo have already discussed marriage. “We want to stay together forever,” she said Thursday. “I wouldn’t do a Vegas [wedding]. I don’t know where or when but I do want it to be romantic.”

Betting that Nicole_Richie and Joel Madden will beat them to the altar, Hilton doesn’t mind following in her best friend’s footsteps another way, as well. “Nicole is our first friend to have a baby … Seeing Harlow, it really makes me want one. I’ve always wanted to have a baby.”

Until then, she’s content on practicing her mommy skills on Harlow. “I’m definitely ‘Aunt Paris.’ ” As for Benji? “He’ll babysit. I can tell he’s gonna be an incredible father. He loves babies.”

Benji Changed My Life in Every Way

With memories of dancing on tables in clubs still fresh in her mind, Hilton, 26, acknowledges how much she has grown since she started dating the Good Charlotte rocker four months ago.

“When I was younger I loved to go out, but now that I’m in a really great relationship it’s so much more fun to stay at home,” she says, “We don’t really like to go out. We have game night, friends come over and play Monopoly. It’s chill.” She also loves pampering her man with some homemade food. “I love to cook for him, I cook great lasagna.”

“I’ve grown up a lot. I’m at peace,” she added. “He’s changed my life in every way. I’m happy.”

Laughing about her beau’s rocker look, she says her she follows some words of advice from her dad to look past it. “My dad said you shouldn’t judge a book by its cover,” she said. “He doesn’t act at all like someone who has tattoos everywhere! I love him so much that I don’t pay attention. I don’t even look at the tattoos anymore.”

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