Taylor Lautner has opened up about Kristen Stewart's cheating scandal.

The Twilight actor has broken his silence about his co-star's "momentary indiscretion" - when she was caught cheating on Robert Pattinson with married Snow White and the Huntsman director Rupert Sanders - and doesn't know whether the trust can ever be regained in a relationship.

"To be honest, I've never been involved in any of those situations, so I don't know [if trust can be regained]. It would be just a guess and a shot in the dark, and I don't want to give that if I haven't even been there myself," he said when quizzed on her infidelity.

The Hollywood hunk was quick to defend his co-star Kristen and insisted he is "proud" of every decision she makes: "Kristen is fantastic at everything she does. I'm always proud of her."