(CNN) Paul McCartney isn't too shy to let everyone know the significance of June 18.

(Hint: It's his birthday.)

The singer shared a photo with a brief caption in honor of his 77th turn around the sun.

"It's my birthday too, yeah," he said.

And everyone from Yoko Ono , a former wife of his bandmate John Lennon, to the estate of George Harrison , the lead guitarist for the group, has shared their birthday wishes.

Happy Birthday Paul!

And Happy Birthday Meat Free Mondays!

It's a very, very intelligent idea.

One plant-based day a week can make a world of difference.

Lots of love, yoko https://t.co/9bNa42Xygg#MFMCountMeIn @MeatFreeMonday@PaulMcCartney pic.twitter.com/n4xFFRl7oB — Yoko Ono (@yokoono) June 18, 2019