The MTV reality babe was looking lovely as she dressed up in a showgirl costume complete with a big feather atop her head while mingling amongst the celebrities at STK for the PUR Jeans party.

Meanwhile, in the latest edition of Cosmopolitan, LC revealed one of her tests for finding the right guy, saying, “I make fun of guys when I like them. I do it as a test to see if they can laugh at themselves.”

Wearing her favorite ripped jeans, the MTV cutie was reportedly there to film a segment for her hit reality TV show “The Hills”.

Meanwhile, as she continues to grow her clothing business aside from “The Hills,” LC recently admitted that she’d love to design intimate apparel, telling, “I’ve always wanted to do lingerie. I would do a sleepwear line. I love going sleep in something pretty. I like clothes even when I am sleeping!”

Everything went down at Los Angeles’ STK restaurant, where Miss Montag and Spencer Pratt were out on a romantic dinner date.  When Heidi noticed that Lauren was holding her LA Fashion Week celebration in the same restaurant, she took action.

It’s a first step in the direction that Montag was hoping to go.  She recently told press, “Obviously I miss her, and she was my best friend for a really long time.  Hopefully one day we will be able to work through this and move on and patch some things up.”

The reason for the brief stay – The Hills hottie is reportedly gearing up to help her co-star roommate, Audrina Patridge, celebrate her 23rd birthday (which happens to be today!).

Meanwhile, LC’s rival on The Hills, Heidi Montag, continues to gap with talk show people about the two’s differences – most recently telling Ellen DeGeneres that she doesn’t miss her “once-close friendship” with Lauren.

“It’s kind of like a weight off my shoulders. Towards the end of our relationship she was just always yelling at me and nagging at me because she didn’t like my boyfriend [Spencer Pratt],” Montag said.

“She had a boyfriend I didn’t like for several years but I didn’t really think that was my job [to say anything],” she added. “I was kind of like let’s just go our own ways.