Singer Katy Perry was spotted having a gala time with her rumoured new boyfriend and disc jockey Diplo in Las Vegas after the duo rekindled their romance last month.

The "Dark Horse" hitmaker was seen enjoying a cosy dinner with Diplo and a few other friends at a restaurant Monday.

They were a part of a group of 14 celebrating a friend's birthday, and everyone enjoyed a Wagyu beef tasting, an assortment of sushi, ice cream and even a flaming Mt. Fuji dessert, a source told eonline.com.

The party wasn't over just as yet as the group even went to a nightclub, where Diplo took over the DJ booth. The bunch of friends danced the night away.

Rumour mills were abuzz with news of a romantic angle to Diplo and Perry's story when they were first seen getting flirty at a Coachella Music Festival after-party in April. In June, they were known to have enjoyed a romantic getaway to Jamaica.

However, if sources are to be believed, they aren't dating. They're simply "friends".

Perry split from John Mayer earlier this year.