Katy Perry and John Mayer have sent the rumour mill into overdrive after they were seen together at a barbecue earlier this week.

Apparently the Firework singer invited her love rat ex, along with a host of other celebrity guests, to her house to celebrate Memorial Day on Monday.

The pop star had a barbecue at her house earlier this week. 

But that’s not all as the couple, who split back in March, are said to have looked very cosy. In fact, they looked ‘back together’ cosy.

A source told Us magazine: “They seem to be back together – or back together-ish. They were very flirty and having a really good time together. They have good chemistry.”

 

John was spotted looking cosy with his former flame.

The news comes after the 28-year-old pop star spent the weekend with Robert Pattinson, who is also recently-single after ending his relationship with Kristen Stewart. Katy and Robert watched a wedding rehearsal in Santa Barbara according to People.

An onlooker said: “Katy and Rob were just sitting next to each other watching the wedding rehearsal in the main courtyard area... There was no PDA between them and no body language that showed they were dating. They just sat together and watched.”