She's 71 years old ... but that didn't stop legendary designer Betsey Johnson from doing a FULL SPLIT on stage Wednesday at Fashion Week ... while wearing a hilarious pair of pink briefs.
Who knows, maybe she's got an extremely high threshold for pain ... she is holding what appears to be a prescription pill bottle after all.
Either way. Respect.
71 Y.O. Betsey Johnson
9/12/2013 3:30 PM PDT BY TMZ STAFF
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