COURTENEY COX is about to start trying for a second child - because she can feel her biological clock ticking.

he former Friends star has a five-year-old daughter, Coco, with husband David Arquette, and the couple is keen to expand its family in the future.

But at 45, Cox feels she can't put off getting pregnant any longer - or she could miss out on being a mum again.

She tells OK! magazine, "We're not trying yet. We're revving up the engines. I'm only ready 'cause time's a-ticking.

"If I was 34, I'd wait another year, because I like those three-to-four gaps. I want Coco to be helping me with the next one. One child is hard. Two is probably harder."

And Cox admits recent reports claiming she can't have any more children are ridiculous: "There was a photo of me coming out of a doctor's office and it said that I'm going through the menopause and that I'm really upset because I can't have another child."