Rod Stewart announces he's going to be a grandfather again with sweet gender reveal video

Sir Rod Stewart is set to be a grandfather again!

Yesterday, the 77-year-old singer announced the exciting news his daughter Ruby Stewart and her partner Jake Kalick are expecting their first child together.

Taking to Instagram, the legendary rocker shared a video of the joyous moment Ruby learned she was having a baby boy, as her dad read the baby's gender off of a sealed piece of paper.

In the clip, cheers erupted when Rod made the proclamation "It's a boy!"

Ruby cupped her mouth and laughed, then embraced her partner Kalick.

While Rod fist-pumped before singing: "Another winkle in the Stewart family."

The little boy - who will be Rod’s second grandchild - is due in April.

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