Justin Bieber gets booed by the crowd... then strips down to his Calvins to reveal his six pack on Fashion Rocks

It wasn't the reception Justin Bieber must have been hoping for.
But after being booed by the crowd, the 20-year-old stripped to his underwear for a segment on the star-studded Fashion Rocks show in New York on Tuesday.
The Baby singer first appeared onstage in a powder blue coat, black tank-top and dark jeans as he teamed up with model Lara Stone, 30, to introduce singer Rita Ora.