Taylor Swift debuted a new song called “The Alchemy” during her acoustic set in Paris, and fans are already dissecting the lyrics for clues about her relationship with Travis Kelce.  The Kansas City Chiefs tight end was in attendance for the show, watching from a box seat as Swift sang lyrics like, "This happens once every few lifetimes," and “These chemicals hit me like white wine.”  Let's watch the video to see how Kelce reacted…