The drummer has confirmed the rumours.
According to an article posted on Fleetwood Mac News, Mick Fleetwood revealed the news during a gig in Hawaii where he lives. He said:
"This is the worst kept secret there is, but Christine McVie will be rejoining Fleetwood Mac!"
It follows her one-off reunion with the band during their gig at London’s 02 Arena last September, her first appearance with the group since departing in 1998.
You can watch footage of them performing "Don't Stop" together below: