LG1 - The Fame (The Fame Monster Standalone is an EP, The deluxe one is branded as The Fame re-issue) so LG2 - Born This Way LG3 - ARTPOP LG4 - Cheek To Cheek (it’s considered a 4th studio album) but chronologically we’re still on the right path. we got LG5 (Joanne) and we’re waiting for LG6.   Just had to put it out there to stop prevent confusion.