Kellan Lutz on landing a role in The Expendables 3

Twilight star Kellan Lutz says he's still in disbelief he got a part in The Expendables 3

The actor is in the action hero packed film later this year - alongside Arnold Schwarzenegger and Sylvester Stallone

Kellan also stars in the new animated film Tarzan - he confessed its hard to not keep grinning...