Pop star Taylor Swift has hit back at Kim Kardashian and Kanye West after Kardashian posted videos online of a phone call between her rapper husband and the singer.
The videos show West apparently on the phone to Swift discussing his song Famous, in which he rapped: "I feel like me and Taylor might still have sex, Why? I made that b***h famous."
West was criticised for the lyric after he first played the song at his Yeezy Season 3 fashion show but he insisted Swift had given her blessing.
Swift denied she had ever heard it.
The lyric is a reference to the 2009 MTV Video Music Awards, when West interrupted Swift on stage as she collected a gong to say Beyonce was the rightful winner. The incident received wide news coverage, with even President Barack Obama dubbing West a "jackass".
West's wife waded into the long-running feud in the early hours of Monday when she wrote on Twitter: "Do u guys follow me on snap chat? u really should ;-)"
She then posted a string of videos of a phone conversation between West and Swift on Snapchat in which West says that he is working on a song and wants to use the lyric: "I feel like me and Taylor might still have sex."
In the call Swift expresses concern that she is close to overexposure but West replied that his song would be good exposure for her.
In the end she appears to give her blessing, saying: "It's like a compliment. I really appreciate you telling me about it, that's really nice."
Swift also acknowledges that it is a "tongue-in-cheek" line.
In a statement after West released the song, a spokeswoman for Swift said: "Kanye did not call for approval, but to ask Taylor to release his single Famous on her Twitter account. ... She declined and cautioned him about releasing a song with such a strong misogynistic message. Taylor was never made aware of the actual lyric."
Swift now denies she lied about giving approval to West for the song, saying the recordings proved she never approved the slur he used in the song.
She wrote on Instagram: "Where is the video of Kanye telling me he was going to call me 'that b***h' in his song? It doesn't exist because it never happened. You don't get to control someone's emotional response to being called 'that b***h' in front of the entire world.
"Of course I wanted to like the song. I wanted to believe Kanye when he told me that I would love the song. I wanted us to have a friendly relationship.
"He promised to play the song for me, but he never did. While I wanted to be supportive of Kanye on the phone call, you cannot 'approve' a song you haven't heard. Being falsely painted as a liar when I was never given the full story or played any part of the song is character assassination.
"I would very much like to be excluded from this narrative, one that I have never asked to be a part of, since 2009."
Earlier this year Swift seemed to respond to the release of Famous when she accepted a Grammy award for album of the year, saying: "There will be people along the way that will try to undercut your success or take credit for your accomplishments or your fame."