Rodimus is only briefly surprised that she knows who he is before deciding that now that the Cybertronians aren't in hiding, of course she knows who he is, and doesn't think any more of it.

"I think I might've seen them in movies, but I've never...er...met one," he gives the majestic horse a scrutinizing look. "'Starlight', huh? Sounds sort of like a Cybertonian name. What does she do? Are horses, you know......sentient?"