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OTRC: Lady Gaga reportedly paid tribute to Princess Diana during concert in London

Lady Gaga appears in the 2011 video for 'Telephone.' (Interscope)

Lady Gaga reportedly spent part of her recent concert in London paying tribute to the late Princess Diana and John Lennon.

The singer appeared at Twickenham Stadium on Saturday, September 8 and performed a single called "Princess DIE," according to MTV News UK, which was dedicated to Princess Diana and Amy Winehouse.

"Since I was a very young girl, the people's Princess was the most important person in me and my mother's life," Gaga said, according to the music news outlet. "I swore if I ever had an audience like this in London, I would take a moment to appreciate her."

Gaga initially debuted the song, which is a ballad, earlier this year. The song's opening lyrics say, "Leave the coffin open when I go / Leave my pearls and lipstick on so everybody knows / Pretty will be the photograph I leave / Laying down on famous knives so everybody sees."

The 26-year-old singer also paid tribute to late Beatles singer John Lennon by performing a cover of his song "Imagine."

During the concert, Gaga called the singer/songwriter the "greatest songwriter ever."

After the concert, which also included 15 costume changes, Gaga Tweeted, "Twickenham, im not even sure what to say. I'll never forget tonight. London you were the fairest of the ball. now THAT was [expletive] fun."

The singer's next performance will be on September 11 in Manchester. Last month, she revealed the name of her upcoming album, which will be called "ARTPOP." No release date has been announced.

The singer recently appeared on the cover of Vogue's September issue.

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