THE RING star, 37, and The Manchurian Candidate actor, 38, started dating in May (05) after meeting at the New York's Museum Of Modern Art's Costume Institute Gala.
Watts reveals she feels completely comfortable with the American actor, who she will spend the next few months with, filming The Painted Veil in China.
She says, "He's just a solid guy and he's complex, which I love.
"And has a brilliant mind, which I am totally in awe of. And he's incredibly funny - you just have to laugh. For some people that's not such an important thing, but I need that.
"We understand each other very well and we're at very similar places in our lives."