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LONDON, ENGLAND - MAY 04: Mike Tindall and Zara Tindall pose backstage with cast members of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)

LONDON, ENGLAND - MAY 04:  Mike Tindall and Zara Tindall pose backstage with cast members of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England.  (Photo by David M Benett/Dave Benett/Getty Images)

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LONDON, ENGLAND - MAY 04: Mike Tindall and Zara Tindall pose backstage with cast members of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)

LONDON, ENGLAND - MAY 04:  Mike Tindall and Zara Tindall pose backstage with cast members of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England.  (Photo by David M Benett/Dave Benett/Getty Images)

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LONDON, ENGLAND - MAY 04: (L to R) Mike Tindall and Zara Tindall pose backstage with cast members Clare Halse and Tom Lister of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)

LONDON, ENGLAND - MAY 04:  (L to R) Mike Tindall and Zara Tindall pose backstage with cast members Clare Halse and Tom Lister of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England.  (Photo by David M Benett/Dave Benett/Getty Images)

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LONDON, ENGLAND - MAY 04: (L to R) Mike Tindall and Zara Tindall pose backstage with cast members Clare Halse and Tom Lister of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)

LONDON, ENGLAND - MAY 04:  (L to R) Mike Tindall and Zara Tindall pose backstage with cast members Clare Halse and Tom Lister of the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England.  (Photo by David M Benett/Dave Benett/Getty Images)

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LONDON, ENGLAND - MAY 04: Mike Tindall (L) and Zara Tindall pose backstage at the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)

LONDON, ENGLAND - MAY 04:  Mike Tindall (L) and Zara Tindall pose backstage at the West End production of '42nd Street' at the Theatre Royal, Drury Lane, on May 4, 2017 in London, England.  (Photo by David M Benett/Dave Benett/Getty Images)