Grimes just dropped some belated pics on Instagram from her iconic Halloween costume, and she was not messing all around. The singer, 34, was completely nude in the pictures, flaunting her sculpted booty, core, and legs in the process. Grimes hasn’t talked a ton about her exercise routine routines, but in 2019, she claimed she spent two hours sword fighting each and every day. It can be challenging to get your Halloween pics out at the appropriate time. Just after all, they can get missing in the noise of every person and their mother sharing their snaps. Very well, Grimes, aka Claire Elise Boucher, just shared her Halloween pictures just…