Enjoying a fun night out in the French Riviera, Taylor Swift attended a boat party in Cannes on Saturday (January 26).

The "I Knew You Were Trouble" songstress looked chic in an all-black ensemble as she happily gave the waiting shutterbugs a smile before heading in to join the crowd.

When you're an international superstar like Taylor, endorsements are just an ordinary day on the job, and it looks like Miss Swift will be adding another company to her already-impressive list.

According to Advertising Age, the 23-year-old country crooner is the latest celeb to partner with Diet Coke. Details of the deal have not been released but it is said that Taylor will take part in a "series of branding initiatives."