When the two met up near the DJ booth later that night, an eyewitness tells Us the lovebirds were "very affectionate, with Eva occasionally rubbing her hand on his face and touching his chin as they kissed."
"It was like two high school kids who just fell madly in love because they were always so touchy-feely," the onlooker added.
The evening capped off a week-long birthday celebration, which kicked off March 12 with a 1920s-themed bash (guests included Kim Kardashian and Heidi Klum).
Three days later, the Desperate Housewives star visited Disneyland in Anaheim, Calif., where she and Cruz were caught making out near the Magic Kingdom.
"My whole family came into town. My sisters, nieces and nephews wanted to go to Disney for my birthday, so why not?" Longoria explained of the outing. "I love Disneyland. I go like three times a year."
Still, the multiple celebrations had to end eventually.