Conor Kennedy, the second grandson of JFK's brother Robert F. Kennedy Sr., was arrested early Thursday morning in Aspen.
Police say Kennedy, 22, was involved in a fight in front of Bootsy Bellows on Hyman Ave. around 2 a.m.
Kennedy was allegedly seen throwing four or five punches to the head of another person.
He's charged with disorderly conduct, an offense that carries a possible penalty of up to a year in jail and up to $2,650 fine.
Kennedy was briefly linked to pop star Taylor Swift in 2012.