Rachel Uchitel -- the pilgrim of mistresses -- wore her finest gown to a 4-hour threesome in Beverly Hills yesterday ... dropping about $5,000 on a whole new 'do, including hair extensions. But when you've got $10 million ....
We're told Tiger Woods' #1 lady went to Norma Bouza -- of the famous Cristophe Salon -- to get locked up.
Locks are hair, right?
Rachel Uchitel -- Overextended in Cover-Up
6/26/2010 4:50 AM PDT BY TMZ STAFF
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