Thats not her. Whoever this model is has a completely different hairstyle than Claire, is a lot leaner than Claire, has more freckles/marks and is missing Claire's scar on her stomach.
I meant to delete that post after I checked again when I thought the nipples and tits looked bigger than in the other photo on Nick's Twitter. Turns out he photographed Katy O'Brien (an actress - Love Lies Bleeding) and I'm pretty sure that's her in the picture lol