Mark Wahlberg was left speechless during filming of a pilot episode for his restaurant-based reality Tv show when a competitive eater scoffed 12 burgers in less than 10 minutes.

The Boogie Nights star opened Wahlburgers eaterie along with his brothers Donnie and Paul in their native Boston, Massachusetts in 2011.

The three siblings spent a year developing a fly-on-the-wall Tv show based at the diner and highlighting the craze for 'extreme eating', but he was wowed by a stunt for the pilot episode.

Wahlberg tells British magazine Seven, "We just filmed the pilot at my brother's restaurant, Wahlburgers, and our star broke his own record by eating four of the triple burgers in eight minutes. This guy'll eat anything: this table, the remote (control), grass, a lobster with the shell - anything."