Josh Hartnett was the hero of the hour after rescuing a 23-year-old girl who injured her ankle while hiking.

Hartnett was walking with a friend in the Malibu, California hills when they spotted the girl, who had fallen and could not walk.

Josh lifted her over his shoulder and carried her back down to the foothills, where he then called for an ambulance.

An onlooker says, "Josh saved this young lady from what could have been a terrible situation. He waited with her for an ambulance and let her use his mobile to call her family and friends.

"Just before she left in the ambulance, Josh hugged and kissed her - and asked her to call him to let him know how her treatment went."