United Kingdom, April 15 -- John Travolta has marked what would have been his late son's 33rd birthday by sharing a rare photograph of the pair together.

The 71-year-old actor posted the image on Instagram, showing him holding Jett Travolta in his arms as the boy reached for his father's ears - years after his boy, who was the eldest child of John Travolta and Kelly Preston, died at the age of 16 in January 2009 after suffering a seizure while the family were on holiday in the Bahamas.

He captioned the image: "Happy birthday Jett - I miss you so much! Love you forever!"

Jett had a history of seizures and had been diagnosed with autism before his death.

John and Kelly also had daughter Ella Bleu Travolta and son Benjamin Travolta.

The...