Reading the SWE3ROTS Vis Dic book awhile back, I noticed a little blurb that said Panaka was the one to tell Charlotte about Padme and Anakin's shotgun wedding on Naboo.
WTF is that ?
I think it's a really silly idea and one that I am going to discard.
Without this "valuable" info, as it stands in ROTS Char just knows and that's all there is to it. How he knows is mysterious and I think that's how it should be.
I am reminded of ROTJ when Vader is looking for ways to bait Luke into a continuation of their fight and I love how he probes around inside Luke's noggin to find that little nugget about his sister. That's how I see Char's interaction with Anakin in ROTS, he goes digging inside to pull out something he can use against him.
Oh okay, but I guess afterall it was just because Panaka told him.