Following the investigation by The Sunday Times, The Times and Channel 4's Dispatches programme into Brand's alleged behaviour, published earlier this month, Olivia says she tracked down a recording of the programme.
The episode, which aired on 21 June, 2008, features this exchange between Brand and Matt Morgan.
This exchange on The Russell Brand Show was recorded minutes after the incident
Morgan: It's been 25 minutes since he showed his willy to a lady.
Brand: (Laughing) Very easy to judge! Very easy to judge!
Morgan: The receptionist…
Brand: (Laughing) Look…
Morgan: Receive this!
Morgan adds: "He got told off for ringing a bell, minutes later he's showing his willy." Brand can be heard laughing in the background.
Olivia, who has never worked as a receptionist, says she felt disgusted when she heard it.