Broadcasting rulemaker Ofcom has warned BBC Radio Ulster in Northern Ireland to clean up its act after it failed to stick to decency rules with the expletive-strewn chat with the Some Like It Hot star.
Curtis was being interviewed for the station's afternoon Talkback programme, and swore throughout the feature, which prompted two complaints from listeners.
The BBC insist Curtis apologised profusely after he realised the show was not pre-recorded.
But despite the apology - Ofcom have warned the broadcaster to fully brief its guests on what they are allowed to say before going live.
Ofcom states that the profanities used were "likely to have gone beyond the expectations of the audience for a programme of this type and at this time".
A live studio audience and at-home viewers discuss leading news events with series host Susan Rook. At-home participation is accommodated by telephone, fax, on-line computer access, and video conferencing.