After 12 seasons, The Big Bang Theory concluded its comedy reign after years of science talk, food talk, and even more science talk, in what was by all means a bittersweet and satisfying finale. But let’s discuss something that’s less Nobel and more Name, shall we? We never found out Penny’s last name! In the only loose thread the sitcom left dangling, Penny’s surname was referred to as Hofstadter while attending the Nobel ceremony in the finale, a moniker she, of course, inherited by marrying Leonard. As for her actual birth name, though? We guess we’ll never know, and Beatles fans will never get the justice they definitely deserve. “I kind of love it,†Kaley Cuoco explained in a new interview about the non-reveal. “So many things are revealed in the last few episodes; you get a lot of satisfying moments. But I kind of love that we’ll never know.â€