Is Katy Perry Back With One Of Her Former Flames? 'Birthday' Singer Spotted In London With Former Love Interest

Katy Perry was spotted putting the moves on former flame Rob Ackroyd after her London leg of the Prismatic World Tour.

The "Birthday" singer and the guitarist for band Florence + the Machine were seen together at a party Perry threw to celebrate finishing up the U.K. portion of her World Tour.

A source for British newspaper, The Sun, reports that they couldn't keep their hands off each other at the event.

"Katy and Rob seemed to be very much back together at her party on Saturday night. They were inseparable, kissing, flirting and cuddling away in front of the roadies, celebs and friends at the bash."

The couple first made headlines when they packed on the PDA at Coachella back in 2012, where they were photographed holding hands. They reportedly started dating casually after the festival but only for about a month before deciding to call it quits.

After reports broke of the budding romance, a source told E! News in 2012, "It wasn't serious. She likes him a lot, but it was just a distraction. It was very short-lived, she's still dealing with getting over her marriage [to Russell Brand] and it's going to take her a while to truly be able to trust anyone again."

Whether or not the two have become an item again might still be a mystery, but nevertheless they remain good friends, an insider tells E! News.

"Katy and Rob are very close and have remained close since they broke up a while ago."