Sonja Norwood, mother of Brandy and Ray J, is suing her son's ex-sex-tape partner for allegedly using her credit cards in 2006 and 2007 against her permission. Kim Kardashian, her sisters Khloe and Kourtney, and her brother, Robert, Jr., are named in the suit.

Kim Kardashian denied the allegations, telling PEOPLE she and her siblings had Norwood's permission to make the purchases.

"We have her signature on all items," Kardashian says.

In the lawsuit, Norwood's mother, Sonja Norwood, who is also her manager, alleges Kim Kardashian had only been authorized in 2004 to make one purchase on the Norwood American Express card in Kim's then-capacity as a stylist for Brandy.

The totaly bill is more than $120 grand. Norwood's looking to be paid the entire amount plus 10 percent interest.