Pop star Katy Perry may not be as single as some may have assumed with reports saying she's back together with an old flame.

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On Tuesday, Daily Mail posted a report from The Sun that mentioned the Birthday singer was reuniting with Rob Ackroyd, the guitarist from Florence + the Machine. Apparently, the two have been spending a lot of time together during Perry's Prismatic World Tour.

According to the site, the guitarist has showed up at several of Perry's shows and they were not afriad to be romantic in front of others.

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"Katy and Rob seemed to be very much back together at her party on Saturday night," a source told The Sun.

"They were inseparable, kissing, flirting and cuddling away in front of the roadies, celebs and friends at the bash," the source continued.

The two allegedly dated in 2012 after meeting at the Coachella festival.

The Hot N Cold star recently told Time Out London Magazine that her upcoming tour will definitely have some moments that fans ought to be excited for.

"There are lots of big balloons," Perry said, published on Yahoo! Celebrity. "My mind sometimes thinks in euphemisms and innuendos and I don't know why. Secretly I'm a dirty birdy."

The pop star then dished on her love life, mentioning that there is a specific dating app that she is not using.

"No. I'm not on Tinder," Perry said. "One of my good girlfriends is on Tinder and sometimes after we're done grabbing about everything we'll just scroll through it. I've only gone on it with one of my girlfriends who uses it to just sideswipe people."