Liza Minnelli tied the knot for the fourth time in the wackiest showbiz wedding ever!

The groom wore makeup … Liz Taylor forgot her shoes … Robert Wagner wandered into the ladies room … Joan Collins dissed David Hasselhoff … and Pee-wee Herman wore pink tights!

But the bizarre antics kicked off two days before the March 16 nuptials — when three Judy Garland impersonators greeted groom David Gest at his bachelor party!

The issue on sale now features exclusive ENQUIRER photos of the $500,000 wedding, including blushing bride Liza in her dazzling designer wedding gown, the star-studded guest list — and much, much more!