Daily Mail reports, The lovely video, which is filmed by US based Caterina - sees JJ entering the room in the skin-tight get-up, based off the 1993 debuted live action superhero show.
His young son, still unaware as to who it is, runs up to give him a hung, before the X Factor star struggles to take off his mask.
Crouching down, the heartthrob picks away at the top of the costume, before a female pal lends him a helping hand - all documented by the model.
After his face is finally unveiled, young Princeton stares at JJ for a short while, before stating, 'Daddy!' - after being asked by his mum who it is.
In a heartwarming moment, he quickly runs into the arms of the Carry You hit-maker, and the duo embrace in a tight hug.
JJ appears somewhat emotional in the short video, which sees Princeton donning hospital garb.
Sharing the video on Instagram, Caterina wrote: 'Princeton immediately ran to his dad who he hadn't seen for eight months as JJ Hamblett is based in London and just finished up a tour with his boy band Union J.'
'Only the video can truly capture his adorable reaction when he realises it's actually his father under the costume,' she added.
Despite not stating the root cause of his illness, Caterina revealed on social media that Princeton was admitted to hospital earlier this month.
However, a number of sweet snaps show the youngster in fighting spirits- proving he's on the road to recovery.
Caterina and JJ reignited their romance last year, after he enjoyed a romance with CBB star Casey Batchelor.
Casey, 32, and the boyband star are said to have been introduced by mutual friends during a night out at London club Cafe De Paris last month and were 'really enjoying each other's company'.
But Casey was left 'shocked' when JJ reunited with his model girlfriend Caterina Lopez - the mother of his son, Princeton, two - without telling her.
A source told The Sun: 'They decided to take it slow and really enjoyed each other's company. Casey was raving about him and thought he was a great guy.
'She has been treated badly in the past and is a sucker for love, so it was shocking for her to all of a sudden see that he and Caterina had reunited. He didn't tell her they were getting back together.'
A spokesperson for Casey told MailOnline: 'I can confirm that Casey was dating JJ Hamblett when he was single. Casey has now moved on.'