"They were very cuddly and cute," a source told E! News. "Katy definitely gave the impression that she and John are 100 percent back together."
Asked about her relationship with Meyer for Vogue's July issue, Perry is quoted saying she is still "madly in love" with Mayer.
"I was madly in love with him. I still am madly in love with him," she told the magazine. "All I can say about that relationship is that he's got a beautiful mind. "Beautiful mind, tortured soul. I do have to figure out why I am attracted to these broken birds."
According to E!, during Saturday's date sources say Perry made certain everyone around them knew they were a couple again.
Swim Week Miami Beach 2014 [PHOTOS]