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The 19-year-old actress has repeatedly said in interviewers that she hated the kissing scene with Grint in the latest wizard instalment, Harry Potter and the Half-Blood Prince.
She said that she was "desperate" for the scene to wrap, insisting it was anything but sexy.
However, Watson is now praising his snogging techniques.
"He was a very good kisser. I think Rupert`s very handsome. Oh totally, he`s looking good. Totally, definitely. Definitely," Contactmusic quoted her as telling London radio station Heart FM.