Stars needing a little PR jolt would be wise to follow Elisabetta Canalis' example: Flash a fake engagement ring. And wait.

George Clooney's other half set off a firestorm at a dinner in Italy when she held up her left hand and flaunted something resembling a giant, glittery rock. TMZ quickly posted photos -- couching them by saying the bauble only "looked like" a will-you-marry-me diamond.

Never mind. It was enough, and the press was off and running. Soon, headlines blaring "George Clooney Off the Market?" were everywhere. The Hollywood powerhouse's rep was quick to shoot down the buzz, saying only that the bling on the Italian model's finger was "a napkin ring" she was playing around with at the table. Yes. Bizarre. Read on for a history of not-quite-engagements.