I don't really believe this. The same article said that Hil & Mike were distant, but the pics say otherwise
And saying hi and being friendly to each other = flirting now?

Hilary is a very touchy girl when she has conversation with someone. Also, of course they were happy to see each other, they were in a video together in 2007
They would be an extremely hot couple though, but Hilary should wait till she's officially divorced to start dating again. Unless Mike and Hil decide to stay together, but that's a whole nother story.