AceShowbiz - Emma Thompson is refusing to apologise to fashion snobs who feel she slipped up by wearing white sneakers for a royal date at Buckingham Palace earlier this month.

The actress was named a Dame Commander of the Order of the British Empire earlier this year, and she showed up at the Queen's London home to be honoured by Prince William wearing comfortable shoes.

Royal watchers and fashionistas alike felt the Oscar winner should have wore something smarter, possibly with heels, but Thompson is adamant she made the right choice of footwear.

Appearing on the "My Dad Wrote a Porno" podcast, the 59 year old Dame said, "They were posh trainers", revealing the shoes were Stella McCartney's $325 (£254) Stan Smith vegan style sneakers.

And she had no idea her Buckingham Palace fashion choice had become a talking point: "I don't do social media so I have no idea when they say, 'Oh my God, you caused a stir!' I go, 'Why?'."

"I got into terrible trouble wearing jeans to Cannes (film festival) once," she added, recalling another fashion fuss she caused. "I was wearing a very sparkly top... and if you're wearing a sparkly top it doesn't matter what you're wearing underneath it. Their fashion police went, 'Oh my God! What is she doing? She is destroying the whole Cannes experience! Everyone is coming to see the beautiful Cannes actresses all dressed up looking gorgeous and look what she is doing, she's wrecking the whole thing!'."