Dakota Blue Richards, who plays Lyra in the upcoming movie The Golden Compass, mentioned Emma and Dan in an interview for You magazine:

Probably the only children in the UK who know from first-hand experience what Dakota is about to go through are the Harry Potter kids. Before she started filming, her producers arranged for her to visit the Hogwarts set and meet Daniel Radcliffe, who plays Harry, and the rest. ‘They were about the same age as me when they first started making the Harry Potter films’ she says. ‘And meeting them helped a lot. They gave me some good tips, especially Daniel. He said, “Know who your friends are – and listen to your mum.” And he said “Whenever you feel that maybe you are feeling a bit weird and different, ask somebody who will tell you the truth – keep people around you who you know will be honest.” I think that’s very good advice. Emma [Watson], who plays Hermione, was really nice as well – we had a bit of girl bonding!

Thanks to EW.net!