Kelly Osbourne has been all over Mercedes-Benz Fashion Week in NY -- and looking crazy cool doing it.

Ozzy's stylish daughter was spotted at the V Magazine party in the Trompe L'Oeil blazer in copper from New York designer Erin Featherston -- which retails online for $875.

Anne Hathaway, Zooey Deschanel and Kirsten Dunst are all fans of the designer as well.