Robert Pattinson 'dumps' Kristen Stewart for Caitlin Cronenberg romance, 'Twilight' heartthrob flirts with married former fling? NOT true, 'just friends'

Robert Pattinson recently hung out with "former fling" Caitlin Cronenberg on the movie set of "Life" in Toronto... should Kristen Stewart be worried?

UPDATE: Robert Pattinson & Kristen Stewart back together, Caitlin Cronenberg 'cheating rumors' spark relationship drama? 'Twilight' heartthrob smoking again, stress prompts bad habit? 

Robert Pattinson 'cheats' on Kristen Stewart with 'former fling' Caitlin Cronenberg? Twitter fans still support 'Robsten' love, rumors FALSE!

Apparently, R-Patz and the well-known fashion photographer "hooked-up" back in July 2013. They were allegedly spotted kissing while hanging out with a group of pals during a "Maps to the Stars" filming break. In fact, the stunning brunette's father (David Cronenberg) directed the movie! He also worked with the "Twilight" heartthrob on his other major hit, "Cosmopolis."

Anyway, rumors suggest that Cronenberg visited Pattinson AGAIN on-set in Toronto earlier this month. But were they acting flirty?

Apparently not.

An insider for Hollywood Life explains, "They are great pals. There isn't anything happening between them. She just happens to be a girl that he is friends with, nothing more."

In fact, Cronenberg just married lawyer Geoff Grove back in September.

Right before the wedding, Cronenberg told The Globe and Mail:

"When I first started reading rumors about myself on the Internet it did bother me. You realize that something is on the Internet and anyone can read it. Now, I really don't care. People can say whatever they want about me. I know what's true. The guy that I'm marrying in five weeks knows what's true and that's all that really matters."

So maybe a Robsten romantic reunion is still possible!