Beyonce to front new American Express campaign

R&B superstar Beyonce Knowles has become the new face of American Express, according to reports.

The 'Irreplaceable' singer - who already endorses products by Pepsi, L'Oreal and McDonald's among others - will front the new advertising campaign for the financial giants, joining the likes of actors Robert De Niro and Kate Winslet, and sports stars Tiger Woods and Venus Williams.