Q: Who is that hot girl in that new Best Buy Summer commercial?

A: Wendy McColm

Wendy is an actress in mostly comedic films. She also has a large presence on the Youtubes doing funny sketches. This is her imdb page:

http://www.imdb.com/name/nm2749141/

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And this is her robust Youtube page:

http://www.youtube.com/wendymccolm