HOLLYWOOD, Calif. — Paris Hilton is shooting down a report that she recently split with her boyfriend Doug Reinhardt.

"Can't a girl have a night out in Las Vegas with her sister, without fake stories being posted," the heiress wrote Monday on her Twitter page. "That story is a ridiculous lie. 100% FALSE."

Hilton was referring to an E! Online story that said the couple had split for a second time. The site noted that Hilton spent the weekend partying in Las Vegas with Kim Kardashian's ex-boyfriend, Reggie Bush, while Reinhardt was with his father in Aspen, Colo., where he was "trying to get over her," according to a source.

Hilton, 29, and Reinhardt, 24, have been dating since February 2009.

Also see: Paris Hilton Photos