New Delhi, April 30 (ANI): Actress Sonakshi Sinha loves to display that lovely smile of hers. Whether it is an award function or any other event, the beauty is forever smiling. And guess what, this has won Sonakshi a big endorsement deal. Sources say that the girl has now been signed up as the brand ambassador for toothpaste brand Colgate although the official announcement is awaited. The actress has been offered a hefty amount for this and it is heard that she has even accepted the offer.