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Lauren Conrad Compliments New Mom Kristin Cavallari’s Rapid Weight Loss

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Kristin Cavallari and Lauren Conrad attend MTV's "The Hills Live: A Hollywood Ending" Finale event held at The Roosevelt Hotel on July 13, 2010 in Hollywood, California.

Lauren Conrad is a lot of things: a former reality star, a successful fashion designer, a bestselling author. One thing she's not? A mean girl.

The 26-year-old California native appeared on Bravo's Watch What Happens Live October 16, where she was asked to answer three questions about her former Hills costars. Conrad was given the option to plead the fifth to just one of host Andy Cohen's inquiries.

The Starstruck novelist was first asked about Justin "Bobby" Brescia, 29, Spencer Pratt, 29, and Brody Jenner, 29. "Who would you marry, who do you shag, who do you kill?" Cohen, 44, asked.

Related: PHOTOS: Lauren Conrad's BFF history

"Can I kill myself?" Conrad joked. "I'll plead the fifth."

Conrad was then asked what she really thinks of former BFF Heidi Montag's multiple plastic surgery procedures; the 26-year-old "Higher" singer famously underwent 10 operations in one day in January 2010.

"Well, that's just unkind," Conrad responded. "I thought that she was beautiful before it. I don't think she needed it. But, personal decision."

Related: PHOTOS: Lauren Conrad's love life

Conrad was then grilled about Kristin Cavallari, her high school arch nemesis and former Laguna Beach costar, who replaced her as the protagonist on The Hills following her 2009 exit from the MTV smash. (Cavallari, 25, and fiance Jay Cutler, 29, welcomed son Camden Jack on August 8.) "Say three nice things about Kristin Cavallari," Cohen prodded.

"She's really good at losing baby weight. That's true!" said Conrad, who's dating University of Southern California law student William Tell, 32. "She is a very pretty girl." After an apparent pause, Conrad giggled and said, "There's a lot of nice things! I was just trying to get more specific. She dresses really nicely."

Related: PHOTOS: Kristin Cavallari's bikini body

Cavallari lost 25 pounds in two months because she "started jogging on the treadmill" when her son was 4 weeks old, she says in the October 22 issue of Us Weekly. The 5-foot-3 star also sticks to healthy eats such as seaweed salad. Plus, "Breast-feeding burns 500 calories a day. That helps!"

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