Sarah Harding is considering freezing her eggs.

She said: "It does get harder to see other people have something that you want. I've even got to the age now where I occasionally find myself wondering, 'Do I need to start thinking about freezing my eggs?'

"I do feel my biological clock is ticking and while I'm not ready right now, I do want to be a mum one day.

"My mum was 39 when she had me and I'd always hoped to start a family before that.

"I still have a few years to go but I do go through stages where it plays on my mind."

Sarah's former Girls Aloud bandmate Nadine Coyle became a mother for the first time in February and the 'Call the Shots' hitmaker was stunned by the changes in her friend when she went to visit her and daughter Anaiya.

Speaking in the new issue of HELLO! magazine, she said: "I really wanted to hold Anaiya but Nadine had her clamped to her the whole time and wouldn't let her go. She's a complete earth mother, which surprised me. But I'm delighted for her."

Sarah called time on her two-year relationship with Mark in September and she says they broke up because they waned "different things".

The 'Biology' hitmaker - who first dated Mark when they were teenagers - said: "I think you have to take something from every relationship and in the case of me and Mark, I learned that going back isn't always the way forwards.

"We're very different people now to who we were when we dated all those years ago. We want different things.

"It's taught me not to expect the world from every relationship and to live in the present more."