Paris Hilton parties late into the night!

Paris Hilton seems unaffected by her recent run-in with the law; the heiress was spotted having a ball in New York.

She was seen at Butter on Monday night partying with a group of guys including her old pal Brandon Davis.

“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,” the New York Post quoted a source as saying.

But source close to Paris said, “She is still with Cy. She”s is in town for a few days with her sister.”

“Her sister, Nicky, went home at 2 a.m., but Paris was still going strong,” the source added.