Katy Perry partied in West Hollywood with John Mayer and 15 other friends on Friday night (07.06.13).
The 28-year-old 'Firework' singer - who has been spending time with the 35-year-old singer/songwriter again recently after they split up for the second time in March - joined 15 other friends at the Chateau Marmont in West Hollywood.
A source told People.com that the on/off couple and their entourage were ushered into the far back corner of the hotel's tented patio, where their security staff kept a close eye on them.
The brunette beauty, who wore a short-sleeved white cashmere sweater and fitted metallic skirt, did not sit beside her on/off boyfriend and they both stayed past midnight.
Despite spending more time together recently, the couple have decided they are not ready to commit to each other.
A source previously said: ''They are just hanging out. They are not putting a label on it.''
A close pal previously predicted that the couple might reunite following their last split.
The insider said: ''It's not over until it's over. You have to see how things play out.''