One of Benefit's lip and cheek stains, it's a candy pink colour, liquid formula. Like a lot of the Benefit stains, it comes in a bottle with a brush style applicator.
You do need to be pretty quick when blending to avoid a streaky face so I would recommend doing one cheek at a time!
My mini bottle of this (that I got with Glamour magazine months ago) is still going strong so I think this is a great value product. The full size is 12.5ml and retails at £24.50.
Have you tried Posie Tint before?