British actress Kate Beckinsale has dismissed rumours her marriage is in trouble - insisting the media assume all celebrity couples play away.

The Hollywood beauty, who is happily married to her Underworld director Len Wiseman, resents the way the gossip-hungry press labels all celebrities as unfaithful partners.

She says, "I have no idea (where the rumours come from). I honestly think it's because other people are a tiny bit more calculated and maybe go to more events and kiss and stuff.

"We've been working and staying at home with our kid and I haven't done anything recently.

"I think after a couple of years of marriage if someone hasn't had a child or something then you have to immediately worry if the man is gay.

"I just don't know."