Really? You can't tell by those pictures? It's almost so obvious lol, look at the one pic where they're looking at each other, big smiles and come on, you don't look into someone's eyes like that if they're just someone you've worked with, well, unless you do haha.
And the other picture where their arms are around each other her hand is right around his waist, again, most people would just keep it on his back.

Maybe I'm just good at reading body language, I don't know lol, but they look like there's something there.