Hilary Swank doesn't mind being naked in front of her boyfriend's son.

The 'P.S. I Love You' actress has no qualms about flashing her flesh in front of partner John Campisi's child, but admits she might have to start wearing clothes soon.

She told America's Marie Claire magazine: "I don't sleep in anything, but my boyfriend's son is six years old, and you wonder at what age you should stop walking around nude. Every morning he comes into the bedroom, and you're just nude. But he doesn't look twice - he doesn't think about it yet.

"I just toss and turn too much when I sleep, and if I'm in clothes, I get all twisted up."

John was Hilary's agent when the couple began dating in December 2006.

Although the pair have no plans to marry in the foreseeable future, the star has started thinking about having a family.

Hilary explained: "For me, my career is like, for lack of a better word, a baby. I always knew that I wanted to act, since I was seven years old. But also from that age, I've been thinking about the day that I would have kids.

"When the time is right, I'll know. I am aware that I am 35. But I am also aware that the timing has to be right."