According to In Touch Weekly, the pair were seen together at the Vida launch party at Voyeur in Los Angeles on January 13.
A source said: "They were very cute together and seemed totally into each other, They couldn’t keep their hands off of one another."
Pivarnick, who left the MTV reality show early because she was fired for not showing up to work and for "missing her boyfriend", is said to be single now.
The source added: "She was making out with him for most of the night and they weren’t trying to hide it at all. This season Pauly D was infamous for hanging out with Mike 'The Situation' and trying to sleep with as many girls that they could... guess he's changed his ways."