adjective

changing frequently, especially as regards one’s loyalties or affections.

celebs trying to appeal to an increasingly fickle public

capricious,changeable,variable,volatile,mercurial,vacillating,fitful,irregular,inconstant,disloyal,undependable,unstable,unsteady,unfaithful,faithless,irresolute,flighty,giddy,skittish,erratic,impulsive,unpredictable,random,blowing hot and cold,labile,mutable