CMT Blog: to Celebrate Big & Best of 2012 will take part in an upcoming eight-hour live stream event to showcase the hottest music and entertainment of 2012. The Big & Best of 2012: A Year End Celebration Presented by T-Mobile kick offs on 12/12/12 at 12 p.m. ET and will include music, stars and more from,, and

An event this size has never been done before, and fans of all genres are sure to find something they’ll love. Country music fans can look forward to a rockin’, never-before-seen performance by reigning CMA duo of the year Thompson Square. You’ll also see an intimate acoustic set by rock goddess Grace Potter and the indie folk duo First Aid Kit. Plus hot country newcomer Dustin Lynch will perform a surprise duet. Keep an eye out for CMT Insider’s own Kourtney Hansen, who will share hosting duties with VH1’s Carrie Keagan and MTV’s Sway Calloway.

As part of the show, MTV wants fans to prove their loyalty to their favorite acts with a social media challenge to see who has had the best fans of the year. Fan armies for Katy Perry, Rihanna, Lady Gaga, the Wanted, Selena Gomez, One Direction, Justin Bieber, Nicki Minaj, Adam Lambert, Bruno Mars, Demi Lovato, Chris Brown and country’s own Taylor Swift hope to win the coveted title as gets ready to end 2012 with the biggest bash of all.