The move sees WPP shoring up its position in Europe, with the network stating that it would "place an even greater emphasis" on the region's growth following Brexit.
Grey Group has bought a majority stake in Famous, which is based in Brussels and last year recorded revenue to 31 December at €8.1m, with assets of approximately €7.5m. The agency's main services include creative, design, strategy, innovation, digital and PR. Clients include American Express and Hyundai. It has already rebranded as FamousGrey.
David Patton, president and chief executive officer of Grey EMEA, said: "In view of the recent Brexit referendum, it’s imperative we actively seek to accelerate our expansion across key EU markets.
"Brussels sits at the heart of the EU and it’s now critical we have a strong agency presence in that city".