February 13, 2015 06:45 PM

When Steven Tyler got word that his daughter Liv had gone into labor over a month ahead of schedule, he hopped on a plane to race to her side.

“When I got the call that Liv was going into labor, after crying like a baby myself, I immediately dropped everything and went to the airport to get on the next available flight,” the Aerosmith frontman, 66, told PEOPLE Friday in a statement later posted to his Facebook page.

Still, the rockstar grandfather cut it pretty close — but ended up making it just in time!

“When I landed I kept calling my daughter Mia, who was already helping Liv, and she kept giving me minute-by-minute updates… ‘HURRY THE BABY IS COMING!’ ” Tyler writes. “I made it RIGHT in time before my second grandson entered this world. It was another (God wink) moment of a lifetime for me.”

Courtesy Steven Tyler

Adds Mia, “There is nothing more special than helping to bring a life into this world with the most important people in your life. So proud to be a part of it. And so very excited to have a new pup in our wolf pack. So much love in this pic.”

Liv, 37, and her boyfriend — sports manager and agent David Gardner — welcomed another boy on Wednesday, PEOPLE confirmed exclusively with a rep for The Leftovers actress. “He’s healthy, and everyone is very happy,” the a rep said at the time. Their new son arrived six weeks early, a source added.

This latest addition to their brood joins older older brothers Milo, 10, and Gray, 7, the couple’s children from previous marriages.

—Jeff Nelson with reporting by Liz McNeil

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