The reality star and new mother recalled Lohan "flirting" and then locking lips with Pauly D - real name Paul DelVecchio - on a night out in Los Angeles to promote the MTV show's first season.
"It was the first time in LA and I feel like she was flirting with Pauly - and I feel like they made out," Polizzi told Celebuzz.
However, she dismissed suggestions that a romance might have developed between the pair, saying: "It was, like, three years ago."
Asked to comment on the Mean Girls star's frequent legal issues, Polizzi said: "Personally, I like Lindsay.
"I think she's a fun girl and she's made a few mistakes and people thinks she's the devil for it."
Speaking about meeting Lohan and her mother Dina in 2010, Polizzi gushed: "She pulled me up to her VIP and she introduced me to her mother. I guess she clubs with her mother.
"Her mum is wicked cool. I mean, she was wicked cool. I was dancing with both of them. We were having a good time… they had a lot of respect for us. They like our show."
Snooki, Pauly D and the Jersey Shore cast
Polizzi - who is engaged to Jionni LaValle, the father of her 4-month-old son Lorenzo - parted ways with DelVecchio and the rest of her Jersey Shore co-stars when filming on the sixth and final season wrapped last year.
The final ever episode of Jersey Shore in December was the least-watched in the show's history.