copycat

(noun) someone who copies another person’s attitudes, ideas, hobbies….

Example Sentences:

I bought a bike, and then my little brother bought a bike. I started to play jazz flute, and my brother did the same. He is a big copycat!

Sarah only started to take ballet classes because Mary did. She is such a copycat!

From the News:

Nokia 5800 a real copycat of apple iPhone

Media:

Similar idioms:

1. all that glitters is not gold
2. the apple doesn’t fall far from the tree