Liv Tyler struggles to understand her new movie 'The Ledge'.

The actress stars alongside 'Children of Men' star Charlie Hunnam - who plays the role of a young man threatening to jump off a high-rise building - as a former drug addict who has an affair with his character in the suspense thriller but Liv finds it difficult to explain the plot.

She said: "I just had to go on 'The View' and they were asking me to describe it and I was struggling with it and then I had no idea what I said because I black out when I go on those shows. I play a woman who had problems with drugs and prostitution and she meets Patrick Wilson's character and they get married. He is a born-again evangelical Christian. He basically saves her life and then she meets a man played by Charlie Hunnam and they have an affair and he's an atheist. It's a thriller."

Although Liv enjoyed making 'The Ledge', she admits she wishes she had been approached to take part in 'The Hobbit' after playing Arwen in the 'Lord Of The Rings' trilogy.

She told PopEater: "I'm definitely not in 'The Hobbit' and I actually don't know anything about it. I realised I need to call my friends in New Zealand to ask them what's going on so I have some facts when I get asked questions about it.

"I kind of secretly, maybe desperate is the wrong word to use, wish I was in it. I would love to go back there and bring my son to New Zealand and see all those amazing people. It was such a magical experience."