Emma Watson, Daniel Radcliffe, Rupert Grint
Cast members Rupert Grint (R), Daniel Radcliffe and Emma Watson (L) arrive for the premiere of the film "Harry Potter and the Deathly Hallows: Part 2" in New York July 11, 2011. Reuters/Lucas Jackson

Yes, the rumour is true. Rupert Grint, who famously played Ron Weasley in the “Harry Potter” film series, really did not do the homework director Alfonso Cuarón gave him more than a decade ago. But he had a very good excuse.

The old rumour says that when Cuarón signed on to direct “Harry Potter and the Prisoner of Azkaban,” the third film from the multibillion franchise, he assigned the film’s main stars a piece of homework. He told them to write an essay about their characters.

Apparently, Daniel Radcliffe, who played the title character, wrote only one page for his essay, while Emma Watson, in true Hermione Granger fashion, turned in 16 pages. And Grint, in a move that was very Ron-like, did not submit his homework at all.

On Monday, the Huffington Post asked Grint to clear the rumour once and for all, to which the 27-year-old actor laughingly admitted, “Yeah. That is true, yeah.”

He offered a good excuse for it, though. He was 15 at that time and was about to take his General Certificate of Secondary Education exams, which are standardised tests taken by students in Britain. Radcliffe and Watson, who were one and two years younger than him respectively, did not have to take the tests yet.

“It’s quite Ron-ish not to do it,” he said. “I think Cuarón kind of appreciated that.”

Regarding the popular theory known as “Ronbledore,” in which Ron was actually Dumbledore who travelled through time, Grint couldn’t form an opinion. He said he still needed to do more research before he could answer.

J.K. Rowling, the author of the Potter book series, had a firm answer, though.

Grint, who stars in the comedy film “Moonwalkers” alongside Ron Pearlman, recently released a statement on the death of "Harry Potter" co-star Alan Rickman (Severus Snape), who passed away at the age of 69 after succumbing to cancer.

“I am devastated to hear about the passing of Alan Rickman, I feel so privileged to have had the opportunity to work with him on numerous occasions,” he said in a statement. “Even though he has gone, I will always hear his voice. My thoughts are with his friends and family at this time.”