Jay-Z is said to be terrified he'll pass out when his wife Beyonc Knowles gives birth.

The American superstar couple are expecting their first child, which is thought to be due early next year.

They are both gearing up to welcome their baby into the world, but Jay-Z is said to have concerns about the labour.

"This is his first child with Beyonc and he obviously has no idea what's going to happen," a source told Look magazine. "He even joked he might pass out."

Beyonc's former Destiny's Child bandmate Kelly Rowland will also be present when the baby arrives and has told Jay-Z she'll lend him some support.

Kelly has been attended birthing classes with her best friend whenever she is Stateside.

"It was pretty much assumed that Kelly would be in the delivery room with Bey when she gives birth," the insider added. "It's obviously something Kelly wants to do."

Kelly has already started splashing out on gifts for the unborn baby. She recently snapped up a 3,200 Swarovski crystal-covered mini-bath.

"Beyonc loved the bath," the source said. "She laughed for an hour on the phone to Kelly about it."