Kim Kardashian West and Kanye West are reportedly set to welcome their baby son on Christmas Day (25.12.15).

The couple, who already have two-year-old daughter North together, are expected to add to their brood around the festive period as doctors predict the reality TV star will give birth to her little one on the worldwide celebratory day.

A source told gossip website ''Doctors have back timed the date of conception and they've been told their son will be born on Christmas day.''

Although the 34-year-old beauty is keen to have a natural birth, it's thought a Caesarian section may have to take place as she reportedly suffers with the condition placenta accreta, which can cause severe blood loss after delivery.

The arrival of her little one may not be for another few months but Kim and Kanye, 38, have already booked out a Deluxe Maternity Suite at Cedars-Sinai in Los Angeles.

Meanwhile, the raven-haired beauty is trying to stay in shape during her second pregnancy, and her favourite way to do so is to walk at least 10,000 steps a day.

Her trainer, Harley Pasternak, said previously: ''She likes to walk while on phone calls; she likes to walk to her sisters in the gated community; and she walks with North.''