"You never know in this business... but right now we're scheduled to wrap [forever] after shooting this new batch of episodes," Disney Channel Worldwide's senior VP/programming Adam Bonnett tells The Post.
Production on the fourth season is scheduled to begin Jan. 18 and end this summer.
The fourth season will reportedly premiere in late spring. "The [new] episodes will continue to roll out at least over a full year," Bonnet says.
"Montana" skyrocketed Cyrus, 17, to fame and made her a global sensation. The show is currently one of the most successful children's TV programs and has generated numerous CDs, merchandise, a stadium tour and feature film.