Kanye West has said he "did not diss Taylor Swift" in his new track, Famous.
In a series of posts on Twitter, he denied reports that she had warned him over "misogynistic" language, writing that she "gave her blessings" to the controversial lyric.
The rap star apparently references Swift in the song, with the words: "I feel like me and Taylor might still have sex / Why? I made that b***h famous."
But Swift's representatives denied that West had called the star to seek permission before putting the song out.
Her spokesman 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, 'I made that b***h famous.'"
In the wake of debuting his new album, The Life Of Pablo, at a listening party in New York, West wrote: "I did not diss Taylor Swift and I've never dissed her ..."
He added: "I called Taylor and had a hour long convo with her about the line and she thought it was funny and gave her blessings ... b**** is an endearing term in hip hop like the word N****.
"I'm not even gone take credit for the idea ... it's actually something Taylor came up with ... She was having dinner with one of our friends who's name I will keep out of this and she told him I can't be mad at Kanye because he made me famous!"
The musician, who is married to reality star Kim Kardashian, said he had run the lyric past his wife.
He shared with his 18.6 million followers: "First thing is I'm an artist and as an artist I will express how I feel with no censorship. 2nd thing I asked my wife for her blessings and she was cool with it."
In 2009, West interrupted Swift as she accepted her MTV Video Music Award, grabbing her microphone to say: "Yo, Taylor, I'm really happy for you and I'mma let you finish, but Beyonce had one of the best videos of all time."
The two were not on the best terms for several years, before making up at the Grammy Awards in 2015.
Swift's younger brother Austin Swift made his thoughts clear on the lyric as he posted a clip on Instagram of himself throwing out a pair of Yeezy shoes, from one of West's fashion lines.
He captioned the photo: "Getting a head start on some spring cleaning. Here we go again."