JUSTIN Bieber was roundly booed after stripping down to his boxers at the star-studded Fashion Rocks in New York.

The 20-year old singer joined model Lara Stone on stage to introduce British songstress Rita Ora.

He was wearing a powder blue coat, black tank-top and dark jeans but told the audience: "I don't feel comfortable unless I'm in my Calvins. So, what's up? Is that cool?"

The Canadian then proceeded to take off his coat and trousers to reveal his tattooed body.

Rita Ora performed one of the more memorable sets at the event held at the Barclays Centre at Brooklyn as part of New York Fashion Week after a six-year break.

Jennifer Lopez was another whose performance wowed the audience at an event that brought together the worlds of music and fashion.

Others who graced the stage were Nicki Minaj, Usher, Pitbull and Miranda Lambert, Perry, Enrique Iglesias, Jourdan Dunn and Jason Derulo.

Bringing the show to a close was legendary rock band Kiss, celebrating 40 years of being a band, who sang I Wanna Rock And Roll All Night.

The event was hosted by TV presenter Ryan Seacrest.