Trends on Instagram come and go and some happen really fast and sizzle out, while some stay for a long time. The latest craze is called #thighbrow and it involves something that's really sexy. And it looks like it has the potential to stay too.

Basically, it's like a thigh-selfie.

It involves showing off where the thigh meets the pelvis.

Most poses show the sexy crease off, now known as thighbrow.

See some more examples below: