Demi Lovato Joins 2012 MTV Video Music Awards Pre-Show!

A year after she chilled on the black carpet with BFF and special pre-show correspondent Selena Gomez, Demi Lovato will be in the spotlight at the during the pre-show to the 2012 MTV Video Music Awards.

Lovato will help get the ball rolling on the big night with a performance of her hit "Give Your Heart a Break" during the hour-long VMA pre-show, which will air live on September 6 from 7 p.m. to 8 p.m. ET/PT. Demi will warm up the VMA crowd prior to the start of the main attraction, which is set to air live from the Staples Center in Los Angeles beginning at 8 p.m. ET/PT.

"This year's 'Video Music Awards' are chock-full of incredible musicians and I'm thrilled to get the party started at the pre-show with a performance of my new song," said Lovato. "I can't wait to be a part of all the action leading into an incredible night of music and fun."

As a part of MTV's "2012 Video Music Awards Pre-Show," MTV News' Sway Calloway, Jim Cantiello, James Montgomery and Christina Garibaldi will take viewers live to the vertical red carpet, behind the scenes and backstage with some of music's hottest stars. Also on the carpet, British TV host and fashion expert Louise Roe will return as MTV's international guest correspondent for the second year in a row.

Leading up to the pre-show, MTV will air a "Jersey Shore Look Back Special" at 6 p.m. ET/PT, featuring clips from past episodes, commentary from the cast and never-before-seen footage in preparation for the upcoming sixth season of "Jersey Shore" in October. During the special, the cast will break in with live hits from the red carpet with their reactions, remarks and messages for fans. The pre-show will also feature the announcement of the all-new "Most Share-Worthy Video" award, presented by Bing.

Lovato will get the party started for a sizzling roster of main-show performers that already includes the VMA debut of One Direction, as well as spots from Taylor Swift, Green Day and Pink. Five-time VMA nominee Rihanna joined the heat on Monday, along with the VMA performance debut of talked-about Odd Future crooner Frank Ocean.

Rihanna is tied with Drake for the night's most nominations, including two bids for Video of the Year.

Among the presenters also confirmed for the show are the Wanted, Andy Samberg, Rashida Jones, 2 Chainz, Ke$ha Miley Cyrus, Wiz Khalifa, Mac Miller and the "Fierce Five," the U.S. Women's Olympics Gymnastics Team that won the team gold medal at the 2012 Olympic Games. The show will be hosted by comedian Kevin Hart and will also feature a performance from Alicia Keys.

The 2012 MTV Video Music Awards will air live from Staples Center in Los Angeles on Thursday, September 6, at 8 p.m. ET/PT. Head to VMA.MTV.com now through August 24 to vote for your favorites, or text BNA to 22444 (message and data rates may apply) to vote for Best New Artist all the way through the show!