The former "Suits" actress chose an outfit by Safiyaa for the occasion, which featured a black halter top with black-and-white sequins fashioned in the shape of branches with leaves.
Royalists will recall the Duke and Duchess of Cambridge were the guests of honour a year ago, while Queen Elizabeth has attended the show 39 times in the past.
The show was hosted by Greg Davies, who recalled how his mother, Pat, 78, was disappointed at the news of Harry and Meghan's engagement she said: "All of us single ladies were a bit disappointed when he (Harry) got taken". "I tell John [Legend] all the time: 'That could be me". They were a lovely couple and its wonderful they are having a baby.
"As I believe they say in royal circles, one is thrilled when two become three", he said.
"Meghan is being told she needs to start dressing less like a Hollywood star and more like a Royal".
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On the red carpet Meghan was presented with a posy by seven-year-old Darcie-Rae Moyse, from Crowthorne in Berkshire.
We can not imagine anyone refusing a Christmas dinner invitation from the royals, but this unusual tradition that runs in the royal family might force one to consider the option of bowing out of the royal Christmas dinner.
The event raises money for the Royal Variety Charity and each year a senior royal are guests.
She also carried a glittering black clutch that look strikingly similar to the Stella McCartney worn to a charity performance of Hamilton with Prince Harry in August.
What is the Royal Variety Performance, you ask?