Actor Ashton Kutcher came to the aid of a group of hikers and jumpstarted their car after its battery died in the Hollywood Hills here.

The driver told gossip website TMZ.com that the car's battery died while they were hiking, so they pushed it to a nearby street and began flagging down other cars in a bid to get someone to help them jumpstart their vehicle.

The group was stunned when the 36-year-old actor spotted them and pulled over, offering to help, reports contactmusic.com.

Kutcher told them that he had to drop his passenger, believed to have been `Black Swan` star and his fiancee Mila Kunis at home first, but quickly returned to the scene to assist them.

The source said that the heartthrob initially struggled to find his own battery, because it was located in the back of his Lexus, but eventually helped them get back on the road.

A member of the group captured a video of the road-side rescue, during which Kutcher can be heard laughing and says: "I've never f****ing not been able to find a battery in a car."