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OTRC: Kylie Jenner makes runway debut, is praised by Avril Lavigne (Photo)

Avril Lavigne cheers as she walks down the runway of her own New York Fashion Week show, where she debuted her Abbey Dawn Spring/Summer 2012 collection, on Monday, Sept. 12, 2011. / Kylie Jenner, teen sister of Kim Kardashian, makes her runway debut at Lavigne's fashion show. (yfrog.com/z/nutofmj / twitpic.com/6k46ln)

Kim Kardashian's 14-year-old sister Kylie Jenner "rocked the runway" as she made her debut on a catwalk at a New York Fashion Week event, Avril Lavigne says.

Kylie Jenner donned several outfits from Lavigne's new Abbey Dawn Spring/Summer 2012 collection at the singer and designer's fashion show on Monday, September 12.

"@KylieJenner you rocked the runway tonight for @AbbeyDawn," Lavigne Tweeted. Great job babe!! Thanks to all the models tonight!!"

Lavigne, 26, is known for her punk rocker style and has been dating Jenner's brother Brody, a 28-year-old model and socialite who also appeared on the MTV reality show "The Hills," since early 2010.

Brody Jenner, Kim Kardashian, 30, and her new husband Kris Humphries, 26, as well as her sisters Kendall, 15, and Kourtney, 32, sat in the front row and cheered on Kendall Jenner.

"Just left @AvrilLavigne's fashion show w my lil sis @KylieJenner walking in it!" Kim Kardashian Tweeted, alongside a photo of the young model. "She was so fab!"

Brody Jenner, Kylie Jenner and Kendall Jenner share a biological father, Bruce. He is married to Kris Jenner, who is the biological mother of the girls as well as of Kim Kardashian and her siblings Khloe, Kourtney and Rob.

The Kardashian family is known for their E! reality series "Keeping Up With The Kardashians" as well as several spin-offs. The Kardashian sisters also have their own DASH fashion line.

Brody Jenner also praised his sister, Tweeting: "Just saw @KylieJenner walk in the @AbbeyDawn fashion show! She looked beautiful and was such a natural. Proud to be her brother :)"

Kylie Jenner Tweeted back: "Awww thank you so much @BrodyJenner ! Love you and loved seeing you and @AvrilLavigne."

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