Liza Minnelli & David Gest

Of all the pricey celebrity weddings, Liza and David's is probably the wackiest -- just look at the wedding party! A 60-piece orchestra played as Liza walked down the aisle, Tony Bennett, Stevie Wonder, and Natalie Cole performed, $700,000 was spent on flowers alone, and their 6-foot-tall, 12-tier wedding cake cost $40,000. The grand total? $3.5 million. They divorced just a few years later. Ouch.