"Someone who was not pregnant with my child, claimed to be pregnant with my child and requested large sums of money," Rock testified.
Pellicano and four other co-defendants have pleaded not guilty to using wiretaps and other tactics to dig up dirt to help clients in legal and other disputes.
On cross-examination, attorney Chad Hummel, who represents former Los Angeles police Sgt. Mark Arneson, asked if Rock knew what kind of information Pellicano was getting for him.
"I relied on what my lawyer told me," Rock said.
Rock said DNA tests later proved he was not the father of the child.
"So you believe the claim to be false?" Hummel asked.
"Yes," Rock said.
Rock testified that he hired Pellicano again two years later after the woman claimed the comedian had sexually assaulted her.
Rock was never arrested or charged in connection with that allegation.
"Did you know Mr. Pellicano was following her?" asked Hummel.
"Not really," Rock said.
