That's a close one!
We don't know any celebs who shy away from showing off their curves on Instagram, and this latest social media nip slip is no exception.
One A-Lister shared a near-wardrobe malfunction on Sunday alongside one of her friends, but she's actually not at risk of showing any nipple.
On the other hand, there is clearly areola visible in the shot, so we guess the mystery celeb was feeling a little bit cheeky!
So… any ideas on who these boobs belong to??