10/15/2009 at 05:45 PM EDT
and Jon Gosselin both reacted angrily Thursday to their former babysitter's allegations that Jon bragged about hacking into Kate's emails, phone records and online bank accounts.
Kate, in a statement, says she's "disturbed" by Stephanie Santoro's allegations. "Ms. Gosselin is carefully considering all of her legal options regarding this matter, and she will pursue them if and when the time is right," said the statement released by Schnader Harrison Segal & Lewis, her Philadelphia law firm.
Jon, meanwhile, says Santoro is lying. "I spoke with him today concerning this statement made by Stephanie and he unequivocally told me that he's never illegally invaded Kate's electronic privacy in any way," says his attorney, Mark Heller. "He also finds it a little disappointing that Kate would give credence to an uncorroborated statement made by an individual who clearly has a motivation to tell stories about Jon that might result in financial [compensation]."
Santoro made the allegations in an interview with Radar Online
. In August, she garnered attention when she was babysitting at the Gosselins' Wernersville, Penn., home while Jon was present. Kate tried to enter the home and called police
when she wasn't allowed in. Last month, Santoro told a magazine she and Jon had a steamy affair, which Jon denies.
Santoro could not be reached for comment.