The phrase "celebrity backers" refers to famous individuals who publicly support or endorse something, such as a product, cause, or political candidate. Full definition
This is what happens when a direct - to - consumer luxury mattress maker and celebrity backers get into bed together. (entrepreneur.com)
Meanwhile, the Leave campaign has been making use of one of its few celebrity backers. (totalpolitics.com)
Despite receiving vocal support from The Evening Standard and several celebrity backers, there were signs that Goldsmith's personal brand had been badly damaged. (businessinsider.com)