Paris Hilton likes pranks – so is there any truth to the rumor that she hasn't returned her 24-carat rock to ex-fiancé Paris Latsis because it's cubic zirconia? "(The story) is absolutely not true," her rep told us in November 2005. The bauble is all diamond – just like the 2.8-carat Chopard ring that Lindsay Lohan sported on her left hand at the time. Who is it from? What does it mean? Said Lohan's rep: "I am not commenting on her personal life."