Ashton Kutcher has played the good Samaritan by coming to the rescue of a stranded driver.

The Two And A Half Men star pulled over and stopped to help the motorist and his friends when their car battery died during a hiking excursion in the Hollywood hills, reported TMZ.com.

Ashton asked them if he could help jump start their car, but only after he dropped off his passenger at home.

The 36-year-old actor kept this word and returned minutes later. He tried to start the battery, although he had initial trouble finding the battery in his own car - a Lexus.

Footage posted online shows the No Strings Attached actor using his mobile phone as a flashlight to look under the car bonnet before asking one of the group to search the internet.

He later admitted: "I've never f***ing not been able to find a battery in a car."

Ashton's good deed came after he enjoyed a brunch date with pregnant fiancee Mila Kunis and some friends in Los Angeles.