The Glasgow event is scheduled to take place July 30, July 31 and August 1, 2021 respectively at the Scottish city's Rouken Glen Park.
The alternative rock band from Glasgow co-founded by Johnny McElhone and Sharleen Spiteri have established a career that's included countless hit singles.
Formerly of pop sensations Liberty X, Simm replaces Wet Wet Wet's original vocalist Marti Pellow.
To celebrate the 30th anniversary of the debut album, 'Popped In Souled Out' Wet Wet Wet is releasing a 5 disc super deluxe remastered edition of the album.
Louis Armstrong visited Great Britain for the first time in 1932…it was quite a visit