Bieber, Ne-Yo, Green Day Set for AGT Finale, 9/13

After months of searching for America's next superstar act, NBC's top-rated show AMERICA' GOT TALENT heads into its final week, with the final live contestant performance show on Wednesday, September 12 (9-10 p.m. ET.) and a two-hour star-studded finale featuring a dynamic lineup of guest performances on Thursday, September 13 (8-10 p.m. ET.) The final remaining six contestants selected from thousands of hopefuls will bring out all the stops one last time, as they compete in front of judges Howard Stern, Howie Mandel, Sharon Osbourne and host Nick Cannon for their final chance at the $1 million prize and a headlining show in Las Vegas.

After a season that has seen an unprecedented and diverse amount of talent -- from waterskiing squirrels to stand-out surprises, including contortionist dancer Turf and opera singer Andrew de Leon -- the final six acts that will compete on Wednesday, September 12 are: Sand story artist Joe Castillo from Lexington, KY, comedian Tom Cotter from New York, Earth Harp inventor William Close from Los Angeles, artist David Garibaldi and his CMYK's from Sacramento, dancing group The Untouchables from Miami and traveling dog act, Olate Dogs.

Joe Castillo https://www.facebook.com/JoeCastilloAGT @joescastillo

Tom Cotter https://www.facebook.com/TomCotterAGT @TomCotterComic

William Close https://www.facebook.com/WilliamCloseAGT @earthharp22

Olate Dogs https://www.facebook.com/OlateDogsAGT @olatedogs

David Garibaldi http://www.facebook.com/DavidGaribaldiandhisCMKYsAGT @garibaldiarts

The Untouchables https://www.facebook.com/TheUntouchablesAGT @UnTouchablesAGT

An amazing lineup of appearances will also grace the "America's Got Talent" stage during finale week on September 13, including a ground-breaking theatrical performance by Blue Man Group and musical performances by Justin Bieber, NE-YO and Green Day.

On the heels of his hit singles "Boyfriend" and "As Long As You Love Me" feat. Big Sean from his latest album BELIEVE, global superstar Justin Bieber makes his next stop on the America's Got Talent stage for the show's grand finale, airing September 13th. His latest studio effort BELIEVE is Justin's fourth #1 album debut and the highest debut album of the year, with four hit singles on the chars prior to the album's release with "Boyfriend," "All Around the World" featuring Ludacris, "Die In Your Arms," and second single "As Long As You Love Me" featuring Big Sean. BELIEVE debuted at #1 in 30 countries, including top markets the U.S., UK, Canada, Australia, Brazil and more and is the highest Billboard soundscan debut of the year.

Multi-platinum, three-time Grammy Award-winning artist NE-YO joins the AGT stage to perform his hit single "Let Me Love You (Until You Learn To Love Yourself)," from his upcoming album, R.E.D., arriving in-stores in November. R.E.D. is NE-YO's first album for Motown after seven hugely successful years and four RIAA gold and platinum albums as a core member of IDJ since 2005. In January 2012, NE-YO was also named Senior Vice President of A&R for Motown, working alongside Barry Weiss, Chairman & CEO of Universal Republic and Island Def Jam Motown. NE-YO's arrival at Motown in 2012 caps an incredible run at sister label Def Jam, where his first three studio albums all debuted at #1 Soundscan and were all certified RIAA platinum: In My Own Words (2006), Because Of You (Grammy Award(R)-winning Best Contemporary R&B Album for 2007), and Year Of The Gentleman (2008), which spun off a trio of RIAA platinum hits: "Closer" (#1 U.S. Dance, #1 UK), "Miss Independent" (#1 U.S. R&B, #1 UK R&B), and "Mad" (#5 U.S. R&B, #3 UK R&B). "Miss Independent" went on to win Grammy Awards(R) for Best R&B Song (song writers award) and Best Male R&B Vocal Performance.