Deepika Padukone - The new Chopard brand ambassador

"Deepika Padukone is the newest face of Swiss Luxury brand @Chopard. Joining the ranks of global ambassadors like Rihanna and Julia Roberts, Deepika is set to create magic with the iconic watches and jewellery brand" (quote by @ELLEINDIA) 

Are celebs allowed to be brand ambassadors for competing brands? Doesn't she already do Tissot a swiss "luxury" watch brand?