By | September 13 2011 1:55 AM

At the Abbey Dawn New York Spring/Summer 2012 collection during New York Fashion Week; Kim, Khloe and Rob Kardashian cheered for their little half-sister Kylie Jenner's catwalk debut.

The 14-year-old Jenner was dressed in a black ballerina collection by singer-designer Avril Lavigne at the Style 360 in New York City.

And in case you are wondering how Jenner landed with this opportunity, Avril has been dating Kylie's brother Brody Jenner.

Check out the images of the Abbey Dawn New York Spring/Summer 2012 collection and Kylie Jenner's catwalk debut below:

Kim Kardashian Cheers for Younger Sister Kylie’s NYFW Debut.

Photo: Reuters

Actress Kim Kardashian reacts while watching the Abbey Dawn New York Spring/Summer 2012 show during New York Fashion Week, September 12, 2011.

Kim Kardashian Cheers for Younger Sister Kylie’s NYFW Debut.

Photo: Reuters

Kylie Jenner presents a creation from the Abbey Dawn New York Spring/Summer 2012 collection during New York Fashion Week, September 12, 2011.

Kim Kardashian Cheers for Younger Sister Kylie’s NYFW Debut.

Photo: Reuters

Actress Kim Kardashian reacts while watching the Abbey Dawn New York Spring/Summer 2012 show during New York Fashion Week, September 12, 2011.

Kim Kardashian Cheers for Younger Sister Kylie’s NYFW Debut.

Photo: Reuters

Designer Avril Lavigne reacts after showing her Abbey Dawn New York Spring/Summer 2012 collection during New York Fashion Week, September 12, 2011

Kim Kardashian Cheers for Younger Sister Kylie’s NYFW Debut.

Photo: Reuters

Designer Avril Lavigne reacts after showing her Abbey Dawn New York Spring/Summer 2012 collection during New York Fashion Week, September 12, 2011

Kim Kardashian Cheers for Younger Sister Kylie’s NYFW Debut.

Photo: Reuters

A model presents a creation from the Abbey Dawn New York Spring/Summer 2012 collection during New York Fashion Week, September 12, 2011.

Kim Kardashian Cheers for Younger Sister Kylie’s NYFW Debut.

Photo: Reuters

A model presents a creation from the Abbey Dawn New York Spring/Summer 2012 collection during New York Fashion Week, September 12, 2011.