Rafferty walked in DKNY's menswear show in a baseball-style jersey, black trousers and leather trainers.
The young model, who is the actor's son with ex-wife Sadie Frost, signed to Select Model Management in October 2013.
Rafferty previously appeared in a spread for British Vogue in June 2012, and also starred in a short film for the Scandinavian clothing label Tiger of Sweden last autumn.
Rafferty Law models for DKNY
Rafferty's famous parents Sadie Frost and Jude Law