She recently demonstrated her loyalty to Free The Nipple, a campaign designed to make the sight of breasts – and nipples – more normal.

And Wednesday was no exception for Kendall Jenner, who abandoned her bra in a tiny white crop top as she hit the race track at Del Mar Thoroughbred Club in San Diego.

Despite turning out for her grandmother MJ’s 82nd birthday, the 20-year-old was determined in her stance and couldn’t have looked more carefree with her latest lingerie-free display.

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Kendall’s top, a Bardot-style ribbed number, sat off her shoulders to leave her decolletage bare, save for a 1950s scarf around her neck.

She was pictured on the balcony, overlooking the race track, cutting a retro figure in scarlet lipstick and cat-eye sunglasses.

Her raven locks were twisted into a top knot to draw attention to her bare shoulders, though her much-loved nipple piercing was not visible in the ribbed top, despite the model recently saying that she liked to show it off.

‘I really don’t see what the big deal is with going braless!’ she said in a post on her personal website entitled Free The Nipple, last week.

‘I think it’s cool and I really just don’t care! It’s sexy, it’s comfortable and I’m cool with my breasts. That’s it!’

‘It’s also a fun way to show off my different nipple rings,” she continued. ‘[My favourite jewellery designer] made me a couple of pieces that are really sick, like a pair of angel wings.’

Among the high profile supporters of the campaign is one of her closest friends, Cara Delevingne, but Rihanna and Miley Cyrus have also joined the Free The Nipple movement.

The brunette is regularly seen on the catwalk without a bra, the first time being when she was just 18.

Kendall even celebrated reaching 40 million Instagram followers by flashing her right breast in an Instagram post eight months ago, saying that it was her ‘favourite photo of all.’