Mr Morton has recently released a book about Meghan Markle but was speaking at The Oldie Literary Lunch to promote his book on American socialite Wallis Simpson, who later married Prince Edward to become the Duchess of Windsor.
The 65-year-old told the shocked audience at Simpson's In The Strand: "I'm sorry I can't go on". Later, Andrew updated his fans on his health via Twitter, writing: "Thank you for all your good wishes - seems that I had a mini stroke, but am doing well & on the mend". A third asked: "Will you be recovered by the royal wedding?"
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Andrew was later due to give a talk at Waterstones on the Kings Road.
Mr Morton was scheduled to appear at another event at a bookshop in West London this evening, but this has now been cancelled. Sadly, we were left with no other option - please accept our sincerest apologies.
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Andrew Morton, the man famous for Diana's secret tapes, has suffered a suspected stroke while on stage during a book signing event in London. It also revealed that Meghan had gone to the same nursery school as Scarlett Johansson, at LA's Little Red School House.
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