George Clooney is selling his tequila company to Diageo for as much as $1 billion, the company announced on Wednesday. But Clooney and business partner Rande Gerber didn't set out to make money by launching Casamigos Tequila.

While building their side-by-side vacation homes in Cabo San Lucas, the long-time friends were spending a lot of time in Mexico — and consequently, drinking a lot of tequila.