Justin Bieber gave his fans a little more than they were expecting last night (December 31) at a New Year's Eve party.

The Canadian star was performing for Dick Clark’s New Year’s Rockin' Eve show as America took in 2013.

However, he gave his fans a surprise after lifting up his t-shirt to reveal his toned body.

His underwear was showing as fans got a glimpse at the body underneath his clothes.

Bieber's set on the night meanwhile consisted of 'As Long As You Love Me', 'Beauty And A Beat' and an acoustic version of 'Boyfriend'.

Other stars performing at the glitzy event included Taylor Swift, Carly Rae Jepsen and Psy.

Watch Bieber perform at New Year's Eve below: