“High Society” socialite Tinsley Mortimer and Paige Management partner Brian Mazza are back together after a monthlong breakup. They reconnected two weeks ago after bumping into each other at a nightclub, a source said. The hospitality guru had dumped the platinum-blond party girl, amazingly because she was “too into the [night-life] scene.” The two were living together and shared a dog before they broke up, but Mortimer kept Bambi. Mazza’s rep told us, “They are back together and they are very happy.”