Rachel Uchitel -- Overextended in Cover-Up

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 -- the same place Lindsay Lohan likes to get locked up. (tmz.com)