Are Paris and Stavros to wed?

Are newly on-again couple Paris Hilton and Stavros Niarchos engaged? When the couple arrived at the alice + olivia Black and White dinner on Monday, Hilton was sporting a huge rock on her ring finger. The socialite played it cool when asked by fellow dinner guests about the ring, refusing to confirm or deny an engagement. Reps for Hilton and Niarchos have not commented.

source