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The 20-year-old actor has been told that his first kiss with Watson, who plays Hermione Granger, will be filmed next month on the set of Harry Potter and the Deathly Hallows.
"As I've known Emma for so long, I reckon it will be 10 times worse," Grint, best known for his role as Ron Weasley in the films, told The Daily Telegraph. "I really love the seventh book, but there is no way it will be tame with the Hermione stuff."
Grint has made headlines recently after it emerged that he filmed a sex scene with Welsh actress Kimberley Nixon for his role in new indie movie CherryBomb.
The star has now insisted that he expects the film to cause less of a stir than Daniel Radcliffe's nude scenes onstage in Equus.
"I don't think it's quite up there with Dan's Equus, but it was quite a surreal experience, especially as we were sharing the bed with half a dozen camera crew," he explained. "But, yeah, I was quite nervous, I think we both were.
"It was a new thing for the two of us - though, weirdly, I remember Kim and I doing a crossword in between takes. That definitely took our minds off the deed."
Speaking about his plans for the Potter scenes, he added: "I'll have a stack of crosswords at the ready."
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