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He/she's gotten too big for his/her boots!
too big for your boots
(British,American & Australian informal) also too big for your britches (American informal)
someone who is too big for their boots behaves as if they are more important or more clever than they really are.
1-Since he was made team captain, he's been ordering us all around and generally getting much too big for his boots.
2-I think he has gotten too big for his boots since he started being a successful Hollywood actor.
3-Now since he is making so much money he has gotten too big for his boots as the saying goes.