Rachel Hunter and Rod Stewart's son Liam announces he is to become a father for the first time

Last week Sir Rod Stewart revealed his daughter Ruby is expecting her first child, but little did he know that his son Liam, who he shares with Rachel Hunter, was also keeping his own baby secret.

The 28-year-old hockey player announced he will also welcome a son with his partner Nicole Ann.

Taking to Instagram, Liam shared a black and white video of him and Nicole posing together during the first months of the pregnancy.

In the clip, Liam is seen holding up the baby's ultrasound image and cradling Nicole's growing baby bump.

The pair are also seen at a gender reveal party, bursting a barrel of confetti in front of a Christmas tree.

Alongside the footage, he wrote: "Mom + Dad | Baby Boy joins us in May."

The little boy will be Rod's third grandchild and Rachel's first.

The legendary rocker welcomed his first granddaughter, Delilah, in 2011, who was born to his daughter Kimberly Stewart and Benicio del Toro.