Last Thursday, John Mayer and Jennifer Maniston were "nonstop, dirty-dancing machines" at a downtown NYC hot spot, blabbed a witness to the NY Daily News.

The source also noticed that Maniston kept away from the hard stuff.

Why no booze, Jenny?

Are y'all working on the baby or is it inside of you already?

Man's getting up there in age! NOW's the time, honey.

[Image via www.xposureuncut.com]

Read more