WATCH: The Rock Sing ‘Happy Birthday’ to a 100 Year-Old Grandma

She's a huge fan

Earlier this week Dwayne Johnson sang to a 100 year-old fan named Marie Grover from Philadelphia.

I don’t know how The Rock finds any extra time between acting in movies, lifting weights and being with his family. Yet, somehow he has found time to re-appear on tonight’s WWE Smackdown premiering on Fox with a blue carpet special at 7.30pm ET and then the main show at 8pm ET.