The brunette, who said she is half black and half Mexican, told Walters the pair met while she was working for Sterling's non-profit organization, the Donald T Sterling Foundation.

Stiviano insisted she was Sterling's personal assistant and not his mistress.

"I'm Mr. Sterling's everything. I'm his confidante, his best friend, his silly rabbit," she said.

An attorney for Stiviano has said the recording was leaked by a third party.

NBA Commissioner Adam Silver imposed a lifetime ban on Tuesday against Sterling, 80, just days after the recording went viral.

Silver said Sterling admitted it was him on the tape.

According to an NBA press release, the ruling is "based on the Commissioner's conclusion that Mr. Sterling violated league rules through his expressions of offensive and hurtful views, the impact of which has been widely felt throughout the league.

After the ban was imposed, Sterling told DuJour magazine, "I wish I had just paid her off."

Sterling has owned the Clippers since 1981. Sources also told ESPN on Thursday that the 80-year-old is battling cancer.