Taylor Swift has partnered with Diet Coke. In a short but sweet-like-the-soda video clip, she revealed she would be teaming up with the soft drink company for various tour promotions and sponsorships, and possibly more. Pop stars and soda pop partnerships are nothing new. Beyonce (for the Super Bowl), the late, great Michael Jackson (who had his hair famously singed while filming a commercial) and Britney Spears all teamed up with Coke's bitter rival Pepsi over the years. But Swift, who is known for her squeaky clean, wholesome-as-milk image, is getting criticized for aligning herself with what's seen as an unhealthy beverage.