Liv Tyler's passionate workout

Liv Tyler is dating her personal trainer.

The 'Lord of the Rings' star was photographed passionately hugging and kissing David Hirsch after an intimate lunch in Westwood, New Jersey, yesterday (22.04.09).

Dressed in a sexy black and white backless sundress, Liv and her new man - who showed off his buff body in a tight green T-shirt and fitted beige trousers - couldn't keep their hands off each other as they walked to his car, stopping in the parking lot several times to kiss and cuddle.

The actress couldn't stop smiling and seemed totally smitten with her new lover.

The 31-year-old actress has been single since last year, when she announced she was divorcing British musician Royston Langdon - with whom she has a four-year-old son, Milo.

Liv recently revealed she felt physically sick when she split from her husband last May, and still finds the break-up difficult to come to terms with.

She said: "There's nothing worse than heartache, being lovesick. It's like there's a physical sickness. You go through a couple of weeks where you think, 'Oh, I'm OK, I feel better,' and then suddenly, out of nowhere, it hits you again.

"The hardest part is when they move out. It also brings up a lot of issues - you might feel like a failure, or like there is something wrong with you. You can't run away from yourself - you kind of have to just deal with it."