Paris Hilton and Kathy Hilton

Kathy Hilton says she and her daughter Paris never had much of a conversation about the infamous 2004 sex tape featuring Paris and Rick Solomon that created an international scandal.

"We never really discussed it. I know that sounds crazy," Kathy told Hollywood 411, in an interview to air Sunday. "It was such pain, and everyone was in such pain, that we had therapy separately, a couple of sessions together, and we never discussed it again."

As for why she broke down during a recent interview with Piers Morgan, Kathy said she never expected the CNN host to ask her about the tape. "That's just such old news — that was a lifetime ago," she said.

Also on this week's episode, the show remembers the lives of two Hollywood icons who died this weekend two years ago: Michael Jackson and Farrah Fawcett.

Hollywood 411 airs Sunday nights at 7/6c on TV Guide Network.