I might need to check my glasses prescription, because Megan Fox's new rib-cage tattoo [1] would have flown right past me if it weren't for her eagle-eyed fans. As part of a steamy new Skims campaign with Kourtney Kardashian, Fox slipped into a black thong and matching bra that showed off the delicate tattoo [2] on her left side. Subtle but noticeable, the new ink looks like a sketch of a bird in flight, so it might be a symbol of freedom or release, but she's kept quiet about the design.

Of course, Fox is no stranger to tattoos — she got her first one, a portrait of Marilyn Monroe, when she was 18 — but it's a mystery why we haven't caught a glimpse of this one before, especially with her cutout-covered outfits [3] and see-through dresses [4] on recent red carpets. We did catch a few tattoo lines sticking out from her Dundas x Revolve dress at the Met Gala afterparty [5], but this is the first time we've been able to see it up close. Fingers crossed we'll get some backstory on the mysterious new ink soon.

In the meantime, take a closer look at Fox's covert new bird tattoo on Instagram here [6].