Realising he'd probably said too much about his co-stars, Rupert very sweetly tried to backpedal. But it was way too late for that!
"We were kids," he laughed, adding that he didn't want to stir up any drama. "It was like any kind of playground romance..."
While neither Emma nor Tom has commented on Rupert's statements, the pair do appear in each other's Instagram feeds fairly often – and they definitely look cosy when it happens!
In August, Tom uploaded a snap of himself and Emma playing a guitar in South Africa, both wearing what appeared to be pyjamas, alongside the caption, "Quick learner x".
Emma – who recently termed herself 'self-partnered' rather than single, following her split from Chord Overstreet last year – has admitted to having feelings for Tom in the past.
“Between the ages of 10 and 12 I had a really terrible crush on Tom Felton," she revealed on The Jonathan Ross Show in 2012.
"We love a bad guy, and he was a few years older and he had a skateboard and that just did it really. He used to do tricks on it. He was so cool. He totally knew [I had a crush]. And the thing is, he’d turn and go, ‘Oh, I see her in a younger sisterly way.’ And it just broke my heart, still does.”
Perhaps not so much anymore...!