Katy Perry strapped a wedding veil to her butt this weekend for one last fling as a single woman -- at a bikini bachelorette party in Vegas with Rihanna and a bunch of her friends.
Our pals at Officialimage.com obtained a whole bunch of awesome photos of the singer lettin' loose at the pool at the Hard Rock Hotel.
Perry -- who was doin' some boozin' at the pool -- was clearly mentally prepared for the weekend ... dropping the following tweet before the weekend kicked off, "Signing up for a liver transplant now.”
The Bachelorette's Bikini Party
9/20/2010 6:00 AM PDT BY TMZ STAFF
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