PARIS HILTON threw an exclusive party at the Social House nightclub in Las Vegas to chat up her new line of jeans, dresses, handbags and tops, and our KEVIN FRAZIER was in the middle of the VIP bash. But the heiress just couldn't contain herself when it came to talking about pal -- and mom-to-be -- NICOLE RICHIE.

"I'm thrilled!" Paris tells Kevin. "It's crazy. I can't believe my best friend's having a baby."

As for Paris' "baby" -- her new clothing line -- she says, "It's such a dream come true."

The must-have clothes will be available at Macy's and Nordstrom department stores on Thursday, Aug. 30th and Paris says "all the clothing is totally my style. People really love the line. So it's exciting."

Earlier this month, Paris caused gridlock in Beverly Hills as she launched the line at her fave Beverly Hills boutique, Kitson.

Helicopters hovered overhead and seven police cars lined trendy Robertson Boulevard as fans and photographers strained to get a glimpse of the celebutante, who arrived wearing a shimmery gold sequined dress from her own line.

Simply called "Paris Hilton," the clothes also include shoes, T-shirts bearing her likeness, satiny bubble tops and lots of chunky sequins.

"I just wanted it to be totally my style using bright colors and lots of sequins," she told us at the time. She said her favorite items are the pink and white gold-foiled T-shirts branded with the slogan "Luv Thy Self."

Even the same twisted seam jeans she wore during her much-publicized exit from jail on June 27th are available. Made with the Dollhouse brand, the denim collection includes skinny, wide leg, and even silver and metallic styles.

"It's completely affordable," Dollhouse reps say of the items. "The most expensive jean is $98 with the average being $78." The line ranges in price from $30 to $100.

Dollhouse also tells ET that Paris has been very "hands-on" in the design process, from presenting her inspirations to brand executives to lending her likeness to a graphic print T-shirt. She recently completed a photo shoot in the Hollywood Hills for the ad campaign.