The 14-year-old model was supported by half-sisters Kim and Kourtney Kardashian, half-brothers Rob Kardashian and Brody Jenner and sister Kendall Jenner as she took to the runway at Style 360 in New York City wearing a black mini-dress with a tulle, ballerina-style overlay designed by Brody's girlfriend.
After the show, Brody tweeted: "Just saw @KylieJenner walk in the @AbbeyDawn fashion show!.. She looked beautiful and was such a natural. Proud to be her brother :) "
Avril added: "@KylieJenner you rocked the runway tonight for @AbbeyDawngreat job babe!! Thanks to all the models tonight!! "
Kourtney was also impressed, tweeting: "@KylieJenner rocked it walking in Avril's Abbey Dawn show! So much fun!!!!"" while Kim -who was accompanied by husband Kris Humphries - wrote: "Just left @AvrilLavigne's fashion show w my lil sis @KylieJennerwalking in it! She was so fab! (sic)"
Kylie prepared for turn on the catwalk, recently appearing in a special prom dress photo shoot for designer Sherri Hill with her sister Kendall.
Following the two day shoot, Kendall wrote on her website: "Kylie joined me on set and we wore the most AMAZING dresses. I was obsessed with every single one!!!
"We shot over two days and I got to wear the most gorgeous prom dresses and work with a really great team."