Ajay Devgn's son Yug celebrates his birthday today on September 13 and on this special occasion, the Singham actor took to his Twitter account to wish him in the most adorable way possible.

Yug could be seen planting a tree and working on a green tomorrow and that's exactly how the actor's caption was. He shared two of his pictures and wrote- "Working towards a Green tomorrow. Cannot ask for more. Happy Birthday Yug. And, lots more to come." (sic)