We know that it's definitely not actress Gage Golightly, because she quickly cleared that one up and shot down any rumors brewing about her and Zayn dating.
Now it sounds like the mystery woman's identity has been revealed: according to The Sun (via Mirror), it's Carlyn Bryan.
A source tells The Sun, "It's early days, but a budding romance between the pair is on the cards. Despite Zayn posting a picture, Carlyn is trying to keep a very low profile and the relationship will be kept under wraps as long as possible."
Not exactly a low profile situation when you snuggle up to a shirtless Zayn and he posts the pic to Instagram. Just sayin'.
Carlyn's social media accounts are private, so don't even try to go digging around. She reportedly said "no comment" when asked if it was her in the pic.