Joe Jonas and Ashley Greene are dating?

Will there be another Hollywood romance?

Ashley Greene and Joe Jonas were kept together in the London's restaurant. Ashley was going to watch the show named "Les Miserable" in West End made by her brother Nick. The News of the World also informed that the source saw them in the restaurant called "The Ivy". The source also mentioned that they were siting to each other like lovers and had a few drinks.
They left the restaurant through the back doors were the two cars were waiting for them.

Ashley Greene was in London to promote new movie - The Twilight Saga: Eclipse.

So are Joe Jonas and Ashley Greene dating?