Hollywood heart-throb Paul Walker has found that his female co-stars are starting to have an effect on him - he often develops an attraction to each one he works with.

The 32-year-old actor, who has worked with Rachael Leigh Cook, Eva Mendes and, more recently, Jessica Alba in the new film Into the Blue, admits he rarely steps away from a movie set without having developed a crush on his co-star.

He says, "I loved working with Jessica Alba. I kind of build little crushes on almost every girl I work with because you're stuck with them for the longest time. They are all crazy and they all have complexes, but you just love them anyway.

"Jessica Alba really kicks a*s though. And she'll kick you're a*s at the same time. I really like that about her."