Lady Gaga + Sesame Street = Out of this World Mashup [VIDEO]

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Gaga is the most popular brand in viral video history, thanks mostly to her hugely successful Vevo music videos. Mashups, covers and spoofs from both professionals and YouTube users have helped grant Gaga even more exposure — as if she needed any.

For its part, Sesame Street has stayed relevant with official spoofs of Mad Men and Apple's iPod commercials. This video is not official as far as we know, but it follows in the tradition of those hits.

The Yip Yips and Lady Gaga seem like a match made in viral video heaven -- people were already saying she was a space alien.

[via BuzzFeed]