Just when you think Dwayne Johnson can’t get any cooler, he goes and does something like this.

The superstar, who left his honeymoon early to be the first guest on Kelly Clarkson's talk showbought his mom a house and attended an impromptu tea party with his daughter, proved once again how good a guy he is when he sent a personalized video to Marie Grover, a fan celebrating her 100th birthday.

In the clip, Johnson sings “Happy Birthday” while Grover watches and laughs in delight. The clip was posted on Twitter Wednesday by Jamie Klingler, who is a friend of Grover's granddaughter.

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