The ‘Famous’ plot thickens.

Taylor Swift threatened Kanye West with legal action earlier this year for recording a phone conversation the pair had about his ‘Famous’ lyric, reports TMZ.

Following yesterday’s fiery statement from Swift, accusing Kanye West of “character assassination”, it has been revealed that Swift’s lawyer sent West a letter back in February stating that recording a telephone conversation in secret is a felony under California law.

The letter demands that all recordings are destroyed, asking to “provide us of assurance that this has been done, and also assurance that these recordings have not been previously disseminated.” A source told TMZ that the conversation was recorded in an LA-area studio.

The controversy surrounding the ‘Famous’ lyric began earlier this year when Kanye tweeted that Swift not only approved, but wrote the lyric to his Pablo track.

The lyric refers to Kanye’s infamous stage interruption at the 2009 MTV VMAs and includes the line: “I made that bitch famous.”

On Sunday night Kardashian revealed that her husband had filmed the conversation with Swift about the lyric, as he keeps a videographer around for all of his album recordings.

Watch West’s video for ‘Famous’, featuring the naked waxworks of a slew of celebrities, including Swift, in bed together.

Update: Taylor Swift cannot sue Kanye West and Kim Kardashian because she knew that Rick Rubin was also listening to the conversation.

California law states that taping “confidential communication” without consent is illegal – but if the conversation can be overheard (i.e., being on speakerphone, like West was), it is exempt, reports TMZ.

TMZ also reports they have heard the taped conversation and that producer Rick Rubin, who appears in Kim’s Snapchats, contributes. According to the tabloid, there is no doubt that Swift knew she was being heard by others.