Yes, when they were filming episode 6. And there were pics of him with Charles.

I don't know if you read it, Alex, but there was a "blind item" from Ausiello (I think, I'm not sure of the source) back in October 2010, and while I know it could be anyone, I just can't stop thinking it might be them. If that rumour is true and it's them, the cast members have to know about this.