What's going on here?!

John Mayer and Girls star Allison Williams were spotted dining together at the Jane Hotel in N.Y.C. last Friday, and while at first we thought this might be a sign of trouble in paradise for the "Gravity" singer and girlfriend Katy Perry, it actually turns out to be innocent fun!

Williams is dating the Grammy winner's good friend Ricky Van Veen, who accompanied them to the American Two Shot store opening before dinner at the trendy West Villiage hotspot El Toro Blanco. The "Fireworks" singer didn't join in on the fun, so Mr. Mayer was the willing third wheel of the evening.

"They were with another guy, but they seemed to be in an intense conversation the entire night and were sitting across from each other at the booth-style table. They were sitting down when we got there for our 10pm reservation, and they stayed until around 11:30pm. They stayed pretty late until the restaurant was clearing out," a source told Daily Mail about Mayer and Williams.

Maybe John is really a changed man after all?