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Grint offered the singer a "shoulder to cry on" over dinner at a London restaurant last week.
The pair first met each other at the Harry Potter and the Order of the Phoenix premiere last summer.
A source told the Daily Star: "They swapped numbers then and although they texted each other quite regularly they didn't meet up.
"Then when Lily split from Ed, Rupert offered her a shoulder to cry on and she took it. They get on really well and he makes her laugh.
"Last week they enjoyed a Japanese meal together where they had a long intense talk as well as a few laughs."
Grint was recently reported to be dating Skins star Hannah Murray.
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