Steven Tyler was on hand to celebrate the birth of his fourth grandchild on Wednesday (May 10) when the singer's daughter, Mia Tyler, welcomed her first child into the world.

Mia shared the big baby news on Instagram with several photos of her newborn son, Axton. "The love of my life has finally arrived and I am now complete. No words can explain how I'm feeling," she writes with a photo of herself holding her firstborn. "Just pure unfiltered love. My son, Axton born May 10th at 5:45AM."

In another post, the country-rocker's daughter shared several photos of her newborn with his family, including one of her dad, cradling her son in his arms. "Best day of my whole entire life. I'm so grateful for my family and my lover for being here & being so supportive. And to the friends and family that came to welcome our new lil wolf cub Ax into the pack."

Tyler and daughter Mia were also present at the birth of Liv Tyler's second child in 2015. At that time, the "Love Is Your Name" singer shared the happy news of becoming a grandfather once again with fans on his Facebook page.

"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 writes. "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!' I made it RIGHT in time before my second grandson entered this world. It was another (God wink) moment of a lifetime for me."

Something tells us Tyler is just as smitten with his new grandson, Axton.

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