Katy Perry: Surprise Performer at John Mayer's Brooklyn Concert!
The 29-year-old singer made a surprise appearance to sing “Who You Love,” which is the couple’s new single. Check the video below!
Earlier in the day, Katy was casual chic while grabbing a bite to eat with gal pal Allison Williams.
The day before, Katy was camera shy while arriving at JFK Airport in New York City.
FYI: Katy is wearing a Temperley London dress.
Katy Perry & John Mayer – ‘Who You Love’ Performance