hanger on
/ˈhæŋər ˌɑn/
noun
- A person who associates with a wealthy or famous person in the hope of gaining some advantage, without being a true friend or member of the group.
- The band's tour bus was full of hangers-on who didn't help with any work.
- The celebrity was surrounded by hangers-on who only wanted his money.
- She grew tired of the hangers-on who never offered genuine support.