The pair was part of a group of 14 celebrating a friend's birthday, reported E!Online.
During the evening outing, Perry, 29, and friends enjoyed an assortment of sushi and ice cream.
The 'Roar' hitmaker and friends later headed to XS nightclub where they waited for Diplo to take over the DJ booth.
Rumours of a romantic relationship between Diplo and Perry first sparked after the two were seen getting flirty at a Coachella Music Festival after-party in April. They later enjoyed a romantic getaway to Jamaica in last month.