"Hey London. I had so much fun with you guys... I think today has been one of the longest days of my life but It felt good seeing all your faces in the crowd. Thank you for the support," she tweeted. "Also I recorded a duo after the show for another blondie and I can't wait till you hear it, now time for bed."
One of our guesses was Britney Spears and as it turns out, we were right! In a new interview with E! News, Britney explained how the whole thing came about.
"I saw her song on TV and I was like a kid in a candy store. I was like, 'I love Iggy!' I was like, 'I love that video. I wanna work with her,'" she explains. Turns out, the respect was mutual. "And it was really weird, because a week after that her manager was like, 'She's a huge fan of yours.' I was like, 'Let's do something together,' so it worked out."
As for when we'll get to hear their song, Britney's lips are sealed. "You'll have to wait and see. It's really exciting though. It's very cool, I'll say that," she said.
With these two together on a track, we can pretty much confirm that it will be "cool" and we haven't even heard a second of the song.
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Gallery | Britney Spears Through the Years