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Lauren Conrad enjoys a romantic lunch with boyfriend Doug Reinhardt while filming a scene from The Hills at the Creperie in Los Angeles on Tuesday.

Doug is the sister of Casey Reinhardt, who was on Season 2 of the MTV reality TV show, Laguna Beach: The Real Orange County. (The Hills is a spin-off of Laguna.)

Splash

Heidi Klum and Lauren Conrad were among the throngs of celebs — including Nicky Hilton, Rumer Willis and Conrad’s former fling Stephen Colletti — who hit Us Weekly’s Hot Hollywood bash at Beso restaurant Thursday.

Clad in Catherine Malandrino and Christian Louboutin shoes, Conrad (who arrived with pal Lauren “Lo” Bosworth) said she opted not to wear a piece from her new collection.

“I’ve been wearing it every single night so I was changing it up tonight,” she told Usmagazine.com.

Conrad stayed close to Bosworth at the bash — at point she told her, “Don’t lose me!” — but she also had some face time with Spencer Pratt’s sister, Stephanie.

(So where were Heidi and Spencer? “I think they missed their flight,” Stephanie told Us. “I was going to come with them!”)

The Hills cast weren’t the only TV stars at the bash.

The Dancing With the Stars crew — including Cheryl Burke, who wore Eduardo Lucerno, and Karina Smirnoff — also boogied.

Klum — Us’ Style Icon of the Year — wore a dress designed by last season’s Project Runway contestant Victorya Hong.

Of being honored, Klum told Us, “It’s a great compliment to my whole team. As you know, everyone who sets foot on a red carpet does not get dressed and do their hair and makeup by themselves!”

Of course, the night wouldn’t have been complete without a fashion emergency.

Lisa Rinna told Us she initially planned to wear a white frock to the bash.

“We went to our store, and he decided to touch up the counter with a little pen, and I went up against the counter and the black pen came off on the white dress!” she said.

“I had to pull this right off the rack at Belle Gray [her clothing line]!”

Luckily, all ended up well.

“Everybody told me this looks better than the white dress,” Rinna said. “Everything always works out.”

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Pictured below:  Eve, Shar Jackson, Nicky Hilton, Cheryl Burke, Lauren Conrad, Marlee Matlin and Jordana Brewster.

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Lauren Conrad at Whole Foods shopping for groceries in West Hollywood and getting a movie at blockbuster in L.A., yesterday.

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