The Tex Mex pals will be ringing in 2012 in New York City's Times Square for MTV's live special.
MTV said Monday that both are due to perform, along with singer Jason Derülo and rappers J Cole and Mac Miller. The night's festivities will be hosted by Tyler Posey of MTV's "Teen Wolf" and Lovato.
The show will air live at 11 p.m. EST.
The people that are really there for me are the people that were there for me when I went into treatment. The people that were calling me while I was in there were Kim Kardashian and Selena Gomez.
Upon Lovato’s exit from rehab (she entered a women's facility for cutting, bulimia and bipolar disorder) Lovato said she made it through thanks to her fans and pal Selena Gomez.
“But, the people that are really there for me are the people that were there for me when I went into treatment.”
Lovato and Gomez go way back. The starlets met on the set of “Barney and Friends” when they were just kids.
“The people that were calling me while I was in there were Kim Kardashian and Selena Gomez.,” Lovato added. “Those two girls, they meant the world to me. They still do.”
The Associated Press contributed to this report.