VIDEO: Tegan and Sara's new Oreo jingle

Leonard is really excited about the new Orea flavors -- cookie dough and Marshmallow Crispy! -- but STAR listeners might be more excited about who singes the new jingle for the famous cookie. It's Tegan and Sara, the Canadian indie duo comprised of two Canadian twins, who will be opening for Katy Perry at the Tacoma Dome in September!

The commercial, which will premiere during Sunday night's Grammy Awards, features an original song sung (but not written) by the pair of sisters. Tegan and Sara follow in a line of musicians who have recorded for Oreo; other artists include Owl City and Kacey Musgraves.

Tegan and Sara are having a big year so far; the pair were tapped to open for Katy Perry on the West Coast leg of her "Prismatic" World Tour. Tickets for the tour go on sale Monday.

The Grammys air this Sunday at 8pm on CBS.

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