Yeah that's what I was wondering. I don't think teenage girls are really the Masterchef demographic. I've been trying to search for more pics of them on Instagram but those friggen Little Mix and One Direction fans are clogging up almost every tag I search. Surely someone else has seen them there. Him liking the pic straight away is a pretty big clue I think.
I think it is definitely him. He liked the photo within about two minutes of her putting it up.