Jack Ross has made his presence strongly felt on Downton Abbey Season 4. He' a jazz singer.
Jack Ross kisses Rose on this episode of Downton Abbey

Downton Abbey Season 4 Episode 6 Quotes

So I'd be welcome in your drawing room, would I? Have you met my niece and her charming bastard?


Robert: Don't be vulgar. What do you know of such matters?
Mary: I've been married. I know everything.