Cast member Charlize Theron and actor Stuart Townsend attend the movie premiere of "Hancock" at Grauman's Chinese theatre in Hollywood, California June 30, 2008. The movie opens in the U.S. on July 2. [Agencies]

Charlize Theron says her boyfriend has made her "softer". The 'Monster' actress insists the love and support of her long-term partner Stuart Townsend has allowed her to open up emotionally and show him her vulnerable side.

She said: "The most amazing thing about Stuart is that he got through to me on a level that no one else did. In my life, there have been two people who have formed me. My mother made me strong and wanted me to be invincible. "Stuart made me softer. He was one of the few guys who wasn't afraid of me. What he saw was not toughness but vulnerability. I am massively vulnerable, and for so long I just worked hard to cover that up.

Stuart wasn't scared to confront that. He is the one man who never worries about kicking me up the backside." Despite not wanting to marry Stuart, Charlize shows her commitment to him by wearing a ring on her wedding finger.

The Oscar winner - who was put off marriage by her parents' turbulent union - added to Elle magazine: "It was a Victorian thing. You put a lock of hair or a little note to remind you of your loved one.

Stuart gave it to me. Every time I go away he puts in a little love note "I wear it all the time. It's not an engagement ring but it is a ring that signifies my commitment to him. I couldn't imagine being in love with anyone more than I am with Stuart. He is beyond special."