De Niro, star of films including Goodfellas, Taxi Driver and Raging Bull, may seem an odd addition to the celebrations but he was in attendance in a professional capacity - his Tribeca company produces the Whatsonstage.com Award-winning show.
Also on show last night were Queen's Brian May and Roger Taylor, who led a curtain call rendition of "Bohemian Rhapsody" and "The Show Must Go On", and book-writer Ben Elton. Among the myriad celebrities in attendance were Lenny Henry, Russell Kane, Samantha Fox, Jilly Johnson, Nick Mason, Martin Kemp, Chris Tarrant, Robert Powell and Mike Rutherford.
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's TENTH ANNIVERSARY PHOTOS,
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PHOTOS BY DAN WOOLLER FOR WHATSONSTAGE.COM.