Her recent run-in with the law hasn’t stopped Paris Hilton from having a ball in New York. The heiress was spotted at Butter on Monday night partying with a group of guys including her old pal Brandon Davis. A spy told us, “Paris was having a good time. She was doing tequila shots and chatting to a lot of old male friends, but there was no sign of her boyfriend, Cy Waits. Her sister, Nicky, went home at 2 a.m., but Paris was still going strong.” Her group also stopped at Avenue. But a source close to Paris said, “She is still with Cy. She’s is in town for a few days with her sister.”