From the 'thigh brow' to 'hip cleavage', there's no shortage of bizarre body crazes to follow - but the latest celebrity trend sweeping Instagram might just be the most extreme yet.
The 'Toblerone tunnel' - a triangular-shaped gap between the upper thighs named after the popular chocolate bar - is currently sweeping celebrity bikini pictures, the Daily Mail reports.
Stars including Kendall Jenner and Emily Ratajkowski have been taking to social media to show off their own in rather racy selfies.
British reality stars have been getting in on the action too, with Made In Chelsea's Louise Thompson and TOWIE's Katie Wright sharing their own sizzling rears.
Here, we reveal the celebrities who have been proudly showing off their very own Toblerone tunnels...