Oscar-winning screenwriter Lance was snapped among the stands at the Olympic Park's Aquatic Centre on Sunday (27 April), where Tom was competing in the men's 10m platform preliminaries and then final.
A source at the event told Reveal: "He looked in really high spirits, smiling and chatting with other spectators in the VIP area before heading to the stands – and he dressed to support Tom too in a Team GB hoodie!"
(And getting into more into the British spirit, the American writer even tweeted a photo of his Union Jack-themed coffee cup just ahead of the final.)
Tom, 19, finished fifth in the event, later telling BBC he'd been battling with the after effects of a concussion suffered after hitting the water hard during training, and nerves over what he deems his "demon dive".
"The scale of this issue is massive," Tom explained to The Guardian. "I'm trying every single thing possible to try and get it back to normal. I'm going under different types of therapy."
Tom added: "I am literally terrified of it. I suppose you could call it a phobia and I don't know what my heart rate is when I go up there and do it but it's definitely above 180, something ridiculous, because it is so terrifying."
Despite not taking home a medal on this occasion, the home crowd was firmly behind Tom.
"The noise inside the Aquatics Centre anytime the camera was on Tom was deafening," said our insider.
"Everyone was supporting him and the other British divers on the day - Tonia Couch, Sarah Barrow and Daniel Goodfellow. Anytime Tom ventured away from the divers' seating area to warm up near the spectators, there were plenty of fans getting very excited and lots of camera phones being whipped out!"
No one, however, was more supportive than Lance, who tweeted after the event: "Proud of you @TomDaley1994 Can't wait to cheer you on all over again in Canada."
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Tom Daley Goes Global: check out pictures from Tom's visit to New Zealand for his ITV2 show below:
Copyright: ITV/TwoFour Production