Tiger Woods' #1 Mistress -- Party Pooper

1/19/2010 7:00 PM PST
All the married men who wanted to party with Tiger Woods' mistress Rachel Uchitel on her birthday are now gonna have to find something else to do that night -- because the shindig has officially been canceled.

According to Rachel's lawyer, Gloria Allred, "The media attention was unexpected and unwelcome and for that reason the planned party at a club will not take place."

Interesting, since the invite has been floating around the Internet for days ... wonder how it leaked?