The Royal Variety Performance was a year ago attended by Meghan Markle, who was at the time pregnant with baby Archie, and Prince Harry.
The duchess, who is the charity's royal patron, was greeted by children from Poringland Primary School as she arrived at the site and she spoke to them individually.
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Inside the event, Kate and William met with well-wishers and performers, including the cast of Mary Poppins.
The Duke and Duchess have previously attended the bash in 2017 and 2014, with Kate wowing in gowns by Jenny Packham and Diane von Furstenberg.
Hosts Rob Beckett and Romesh Ranganathan acknowledged their spectators in the royal box, joking to the crowd that William and Kate were on a "date night".
Sir Rod Stewart was also supposed to attend, but was forced to pull out at the last minute on "strict doctor's orders" due to a throat infection.
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The comedians then asked the pair whether they'd paid the babysitter "until 12 or 1", adding, "It's always worth £20 for the extra hour", the Daily Mail reports.
Taking to the Kensington Royal Instagram account, the couple shared four snaps - including a black and white photograph of the Queen arriving for the #RoyalVarietyPerformance in 1952, with The Duke of Edinburgh and Princess Margaret.
The Royal Variety Performance is created to raise money for the Royal Variety Charity, which was formerly known as The Entertainment Artistes' Benevolent Fund.
In July 1919, the second Royal show was performed and was the first to be billed a 'Royal Variety Performance, ' before becoming an annual event in 1921.
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But even that tentative "Phase 1" deal hasn't been officially signed as China presses the U.S.to roll back its tariffs. Big differences over China's technology policies were largely unaddressed and left for future negotiations.