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Leaving on a jet plane!

Rockstar grandpa Steven Tyler was all smiles alongside daughter, actress Liv Tyler, after she welcomed her second son on Wednesday (February 11). Joined by his daughter Mia, the Aerosmith frontman, 66, shared his excitement via Facebook Friday.

“When I got the call that Liv Tyler was going into labor, after crying like a baby myself, I immediately dropped everything and went to to the airport to get on the next available flight,” he wrote. “When I landed I kept calling my daughter Mia Tyler who was already helping Liv and she kept giving me minute by minute updates,”HURRY THE BABY IS COMING!”

The proud grandfather concluded with a touching anecdote.

“I made it RIGHT in time before my second grandson entered this world,” he added. “It was another (God wink) moment of a lifetime for me.”

Liv, 37, and her boyfriend — sports manager/agent David Gardner — welcomed their son on Wednesday. “He’s healthy, and everyone is very happy,” the a rep stated. According to a source, their new son arrived six weeks early.

The newborn joins older older brothers Milo, 10, and Gray, 7, the couple’s children from previous marriages.