ARMY aren’t the only ones celebrating BTS topping multiple *Billboard* charts with their newest album. RM took to Instagram Stories on Monday (March 30) to thank fans for helping the K-pop group reach No. 1 on both the Billboard Hot 100 and Billboard 200 charts. Related BTS’ ‘Swim’ Is No. 1 as Songs From ‘ARIRANG’ Make Historic Start on Billboard Global Charts How BTS Took Over the World: A Timeline of the Group’s Biggest Career Moments BTS’ ‘Swim’ Debuts at No. 1 on Billboard Hot 100 “Sendin my luv and gratitude” the rapper wrote over a repost of a *Billboard* Instagram post sharing the news that “SWIM,” the lead single from BTS’ new album *ARIRANG*, debuted at No. 1 on the Hot 100. In a second, captionless Instagram story, RM also shared *Billboard*‘s post on *ARIRANG* topping the Billboard 200.…