Abhishek Bachchan's birthday message to his baby boy' Agastya is beyond cute!

Mumbai: Grandson of superstar Amitabh Bachchan, Agastya Bachchan Nanda turns 16 today and his Mama (maternal uncle) has sent him a heartfelt birthday note.

Son of businessman Nikhil Nanda and Shweta Bachchan, Agastya is the nephew of actor Abhishek Bachchan and the two of them are share a close bond.

Bachchan Jr took to Twitter to let his ‘baby’ know what he thought of him:

Can't believe he's turned 16! Agastya, you are growing into a fine, caring, loving gentleman. But for me, will always be my baby. To the coolest dude I know.... happy birthday.

Isn’t that a cute way of saying ‘I love you' and 'I got your back’?!

Agastya’s birthday comes days after his cousin, Aradhaya Bachchan’s birthday, which was celebrated by the family with a grand pink-coloured theme party.

Apart from Abhishek, Nanda’s sister Navya Naveli also wished him on Instagram.