Megastar Amitabh Bachchan was recently in the capital to celebrate his grandson Agastya Nanda's 13th birthday.

The `Shahenshah` star felt nostalgic and happy as his daughter Shweta Nanda's son turned a teenager Saturday.

`Agastya's birthday. Enters his 'teen'. Here to wish him,` Amitabh posted Saturday night on srbachchan.tumblr.com.

While his grandson was covered in a hood, Amitabh was spotted in casuals with a jacket on.

Saturday early morning, he had posted: "He (Agastya) was just born the other day and we were all rushing from different parts of the country to the Breach Candy Hospital for the delivery.`