Sharon Osbourne -- I Had My Vagina Parts Tightened ... And It Hurt A LOT!!

Sharon Osbourne runs a tight ship when it comes to her lady parts -- and is proudly admitting getting "excruciating" plastic surgery on her vagina ... all for Ozzy Osbourne.

Sharon copped to all sorts of cosmetic procedures in the past, but on the BBC's "Graham Norton Show" this week she revealed her crotch chop was by far the most the most painful one.

As for the results -- you gotta hear Sharon's explanation as to why it was all worth it ... at least for Ozzy.

Designer vaginas -- by vaginaplasty and labiaplasty -- have become all the rage ... and not just in Beverly Hills.

As we first reported ... Anthony Wiener's sexting buddy Sydney Leathers got snipped and plans to auction off her spare labia bits.