Jacob Schwartz is a hair colorist and the hair color trend ambassador for Schwarzkopf. He's worked with a ton of big names, including Bella Hadid, Troye Sivan, and Sydney Sweeney.

Or Sydney Sweeney going from bombshell blonde to jet-black lengths ... we must give due to the blonde 50s-esque lob and curly blood-red hair looks, too. Snaps to the creative geniuses and ...