All summer, GMA producers have been asking the artists who performed in the 2010 Concert Series to autograph a poster on the day they performed. Now all 15 posters will are being auctioned off on eBay to benefit this Friday’s Stand Up To Cancer event.

Posters autographed by Miley Cyrus, The Black Eyed Peas, Alicia Keys, Usher, the Jonas Brothers, Demi Lovato, and more are up for bid.

Spearheaded by CBS News anchor Katie Couric, who lost her husband to cancer in 1998, Stand up to Cancer will air Friday night at 8pmET on ABC, CBS, FOX, NBC, Bio, Discovery Health, E!, G4, HBO, HBO Latino, MLB Network, mun2, Showtime, Smithsonian Channel, The Style Network, TV One, and VH1. The night is hosted by Couric along with Diane Sawyer and Brian Williams.

> Earlier on TVNewser:

• Sept. 2008 – Anchors, Networks Stand Up to Cancer

• May, 2010 – Katie Couric, Diane Sawyer, Brian Williams Stand up to Cancer… Again