Katy Perry & John Mayer: House Party Pair!
The 27-year-old entertainer and John, 34, tried to keep low profiles as they left the residence and hopped in the same car before driving off.
Katy and John were spotted leaving the Chateau Marmont together earlier this month!
Earlier in the day, Katy and her gal pals caught a movie at the ArcLight Cinemas in Hollywood.
25+ pictures inside of Katy Perry and John Mayer leaving a house party together…