Reports surfaced this week claiming that "Roar" singer Katy Perry and the Florence + the Machine guitarist Rob Ackroyd were spotted getting their PDA on together during a celebration in London following the U.K. leg of Perry's Prismatic World Tour. A source said, quote: "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."