Coronation Street’s Lisa George, actor Colin Salmon and rugby star Danny Care will also embark on the musical theatre masterclass.
Each star will be supported by a full West End ensemble and a live orchestra as they take on some of the biggest hits from the most popular musicals, ranging from Frozen to Hamilton.
John Barrowman will return as host while West End star Elaine Paige will again head up the panel of mentors, which will also include Hamilton star Trevor Dion Nicholas and Les Miserables actress Samantha Barks.
The foursome will open the show with a performance from Grease, and the ITV special will include a special performance from the stars of The Phantom Of The Opera as they celebrate 35 years in the West End.
Jacqueline Jossa open up on ‘terrifying’ new TV role
Jossa said: “I am so excited to take part in All Star Musicals, it’s thrilling and terrifying, and I can’t wait to tackle a musical number that everyone knows and loves. My girls are going to love seeing me up on that stage.”
GMB’s weatherman Alex Beresford added: “There’s a fine line between panic and excitement, but I can’t wait to challenge myself and feel the thrill of performing a musical number in front of a crowd.
“The acoustics in my shower are very sympathetic.”
All Star Musicals will air later this year on ITV and ITV Hub.