Kate Middleton is often spotted in her favourite footwear at more casual events[Getty]
The Duke and Duchess of Cambridge stepped out with Prince Harry to show their support for their mental health charity Heads Together recently.
But as Prince George and Princess Charlotte's mum and dad chatted to runners, social media users were chatting about something else entirely, Kate Middleton's Superga white trainers.
Kate paired the canvas plimsoles with black trousers, a white, blue and red stripy top and a zip up Regatta black jacket with the charity's logo on it.
And it seems this isn't the first time Kate has opted for the comfier option over her LK Bennet heels.
Kate Middleton wore Superga trainers for the race [Getty]
Commenting, on Kate's shoes, one fan wrote: "I'm ordering mine now! #replikate."
Another added: "Kate’s in her element in sporty clothes and manages to look chic and comfortable in them.
Kate Middleton's best fashion moments
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Play slideshow Kate Middleton's best fashion moments
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Play slideshow The Duchess of Cambridge ditches her typically royal ensembles in favour of a smart shirt and jumper combination during a farm visit [Wenn]
From high-street to high-end, Kate Middleton never fails when it comes to her fashion choices – we take a look at her best outfits
"I'm so glad she didn’t forget to put on some diamond earrings though — she would be less than a real princess without them."
While another commented: "Kate look relaxed , happy and adorable. Sporty looks suit her!"
Kate Middleton is a big fan of the affordable canvas plimsoles [Getty]
But where can you get Kate's trainers from? Well, the pale grey Superga trainers cost just £50.
The Superga 2750 Classic Canvas Trainers In Pale Grey cost just £50.00 from ASOS and are still available in a handful of sizes.
Prior to the London Marathon, Kate fans were left torn over her blouse for her BBC Radio 1 appearance.
Commenting, one fan wrote: " Oh my goodness, she looks absolutely adorable!!!"
Kate Middleton wore a white lace blouse and black trousers [PA] Kate Middleton and Prince William made an appearance on BBC Radio 1 [PA]
Another added: " Love this look! It's so soft and pretty. I'm also all for hair off her face. Also love the style of the top. The sleeves are so pretty and flattering."
But others thought differently: "Would like to see Kate looking more modern; not so frumpy. If you look back at Diana's first few years, this is how she looked until she started asserting her independence. Whoever is giving Kate advice needs to be replaced."
Which sparked an argument, hitting back one fan wrote: "I disagree. She has looked more and more chic each year and especially this past year."
What do you think of Kate's trainers? Let us know on Twitter!