See Taylor Swift's Diet Coke Ad Before TV Debut

(AP)

Singer, songwriter and Diet Coke brand ambassador Taylor Swift has a new commercial and she wants everyone to know it.

The 30-second spot — set to air Thursday during "American Idol" — shows Swift sipping Diet Coke while writing her hit single "22" in a hotel room as fans sing along in various settings.

"The Diet Coke commercial! Check it out- it airs tonight tonight during Idol. http://cokeurl.com/nnyh," the 23-year-old singer tweeted.

Swift is currently on a world tour in support of her album "Red."