The Heart Butt Challenge, also known as Butt Heart Pose, is a social media trend and internet challenge in which people, typically women, upload photos taken from behind of themselves bent over at the waist and joining the tips of their fingers around their knees, making a rough heart shape. The trend purportedly began in Japan and was started by X / Twitter user and cosplayer @kykyky618.

The trend went viral in early April 2026 on sites including X / Twitter and Instagram as it spread online. The challenge largely consists of photographs, but also includes drawings and other forms of art, such as pop culture characters depicted in the pose, similar to the Jack-O Crouch.

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