Okay, this week is definitely looking showbiz-y… we started off with Toni Gonzaga for Samsung Champ DUOS and now we have another celebrity endorser in tow — Chef Marvin Agustin for Knorr Cubes! Yes folks, Marvin took up culinary studies and is now a full-fledged chef. Prior to Chef Marvin’s formal introduction as Knorr’s brand…