Mischa Barton believes Nicole Richie is going to have the most "fabulously dressed baby".

'The O.C.' star presented pregnant Nicole - who is due to give birth on New Year's Eve - with some stylish rock band T-shirts to ensure the baby will follow in its mother's fashionable footsteps.

Mischa said: "I got her a bunch of rocker tees for the baby, with different types of logos of rock bands on them. And she loved them! They were so unique. I just loved them!

"She is going to have the most fabulously dressed baby, I am sure, because she is so stylish herself."

Despite Nicole's father, singer Lionel Richie, claiming 'The Simple Life' star and fiancé Joel Madden are expecting a boy, Mischa insists the couple do not know the sex of their unborn child.

She added to People magazine: "She actually doesn't know what she is having. She wants it to be a surprise."