Video: Proud Kourtney pays tribute to Travis as he performs at Sabbath gig | Daily Mail Online

Kourtney Kardashian paid tribute to husband Travis Barker as he took part in a 'drum-off' with fellow drummers Chad Smith and Danny Carey during the show. The three percussionists took part in a 'drum-off' after being introduced by Momoa, with the aim of establishing 'the greatest drummer in the world.'