Hollywood star Cher is preparing to be a 'dancing Queen' in the sequel to Abba movie musical Mamma Mia!

The Oscar-winning actress is in London rehearsing choreography sequences for the film Mamma Mia! Here We Go Again.

The Mail can reveal she will appear in two song and dance sequences in the follow up to the 2008 Mamma Mia! Movie, which starred Meryl Streep, Colin Firth, Pierce Brosnan, Julie Walters, Amanda Seyfried, Dominic Cooper and Christine Baranski, all of whom are in the new film.

Singer and Hollywood star Cher (pictured) is set to make her return to the big screen with an appearance in the Mamma Mia sequel : Mamma Mia: Here We Go Again

Lily James is also in the film as the younger version of Donna, Streep's character.

The cast has been shooting on locations in Croatia but they will join Cher on the dance floor set up at Shepperton Studios later this week.

Cher's role and names of the Abba numbers she'll sing are being kept under wraps.

'Cher's our secret weapon. It'll spoil the fun if we give anything away,' an executive connected to the film explained last night.

Cher, 71, has not been in front of film cameras for several years, although she has been busy touring and collaborating on developing a Broadway musical based on her life and career.

The 71-year-old Moonstruck star will join Meryl Streep (pictured centre left), Colin Firth, Pierce Brosnan, Julie Walters (centre right), Amanda Seyfried, Dominic Cooper and Christine Baranski (left), who are all starring in the second film

Her Oscar was for best actress in Moonstruck in 1988.

The stage show will feature her signature chart-toppers such as I Got You Babe, Gypsies, Tramps and Thieves and The Shoop Shoop Song.

Cher revealed on her Twitter feed that she has been rehearsing dance numbers but didn't disclose the name of the project.

However, she happily admitted to being in the UK where, she noted, 'It's always felt like home.'

Mamma Mia! started out on stage in London eighteen years ago where it remains a West End favourite.

Judy Craymer the producer who helped create the show also backed the 2008 film which took one billion dollars at the box office worldwide.

Cher will be performing two song and dance numbers, which she is currently rehearsing in London