Paris Hilton Lashes Out At Radio Host After Thinking She's Off-Air

Paris Hilton tried to play it cool during a radio interview with Raleigh-Durham's deejay Bob Dumas of the "Bob and the Showgram" when he asked about her sex tape - while the heiress was promoting her new song "Good Time."

But as soon as Hilton thought she was off the air, she calls Dumas a "f---ing a--hole," telling her rep on the other line, "I'm never doing that show again."

"He didn't even ask about my song," she laments, to which her rep replies, "I've already got a call in."

Meanwhile, the radio hosts are cracking up.

Listen below. Paris gets real around 3:13.

Now listen to Hilton's latest single "Good Time" below, in which she asks "are you having a good time?" over and over: