Former American Idol judge Kara DioGuardi is preparing to become a first-time parent.

The songwriter and her husband, Mike MCCuddy, are expecting a son via a gestational surrogate in the next few weeks, and they have already chosen a name for the baby.

She tells, "We are eagerly awaiting the healthy and happy birth of our son Greyson James Carroll MCCuddy."

The pair married in 2009, but faced a series of fertility issues and failed in vitro fertilisation (Ivf) attempts before opting for a surrogacy.