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Oh baby, baby, how was she supposed to know?

Britney Spears is hilariously admitting to not knowing who legendary musician Mick Jagger was back in the day, when the two carried on an awkward conversation ahead of the 2001 MTV Video Music Awards.

The pop star took to her Instagram to recap their informal meeting, writing beneath photos of the two, "I had no idea who I was talking to."

At the time, both Spears and Jagger were on the verge of album releases, with Spears' third-studio album "Britney" and Jagger's fourth solo-album separate from the Rolling Stones, "Goddess in the Doorway."

Kurt Loder interview Britney Spears in a black dress who looks at Mick Jagger in a red shirt and black suit

Britney Spears, middle, and Mick Jagger spoke with Kurt Loder, left, at the 2001 MTV Video Music Awards in New York. (KMazur/WireImage)

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Spears was a performer at the awards show while Jagger was a presenter.

MTV host Kurt Loder, taken aback by the pairing, asked Jagger if he was a fan of the young artist.

"Of course I am," he said, giving Spears an opportunity to flash a look of surprise.

Britney Spears looks hilariously at Mick Jagger as he speaks during an interview at the 2001 VMAs

During the interview, Mick Jagger admitted to being a fan of Britney Spears. (KMazur/WireImage)

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"And she did one of our songs, didn't she," he continued.

"Yeah, yeah, yeah, yeah," Spears agreed, obviously uncomfortable. On her second album, "Oops!…I Did It Again," Spears covered the Rolling Stones hit "(I Can't Get No) Satisfaction," originally recorded in 1965.

Jagger admitted that Spears had done the rendition "very well," leading to a moment of confusion masked by modesty.

"Well it's because I'm sitting right here," she said, sharing a laugh with the Rock 'n' Roll icon.

Mick Jagger in Berlin performing with the Rolling Stones pointing in opposite directions on stage

At 79, Mick Jagger is still performing with the Rolling Stones. (INA FASSBENDER/AFP)

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"You'd tell me that," Jagger quipped. 

"Well thank you, that means so much," Spears added.

At one point, Loder even said to his guests, "You two have never met before, right?"

Both stars ignored the comment, quickly pivoting the conversation to Jagger's new album.