When Jessica Gibson asked Rob Lowe for $1.5 million to stay quiet, she didn't pull that figure out of her ass.
According to documents filed yesterday, Jamie Gibson Sprovieri -- the older sister of Rob Lowe's accuser, Jessica Gibson -- says Gibson came up with the $1.5 mil figure because "she had heard that another well-known actor had paid that amount to a woman who threatened to bring a sexual harassment claim against him."
Gibson's sister also says that her sister told her that if the Lowes had only paid her the $200 she felt she was owed, she never would have been threatening a lawsuit against them.
Sprovieri says her sister never made any mention of any wrongdoing on Rob Lowe's part ... until Gibson demanded $1.5 million from Lowe to stay quiet.
Sister of Lowe's Nanny Cries Sister Act!
6/27/2008 8:56 PM PDT BY TMZ STAFF
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