He'll be playing the role of Warner alongside former "X Factor" contestant Lucie Jones who will be putting on her pink heels for the lead role as Elle Woods, reported Digital Spy.
Theatre veterans Ian Kelsey and Jon Robyns also join the cast as Callahan and Emmett.
Mac has a previous theatre history, taking to the stage in hit musical Wicked before landing the role of Dodger on the Channel 4 soap.
The production kicks of at Leicester Curve from April 11.