Manzo, the daughter of Real Housewives of New Jersey star Caroline Manzo, tells PEOPLE that her beau did everything right on the big day.
"Vito went and got a shave, his eyebrows waxed and a haircut. Then he showed up at 5:30 wearing a sportscoat even though I normally have to force him to dress up," she said.
"He had a big bouquet of red roses and got down on one knee. When I looked up, both of our families were in the window and he was crying and shaking and I'm hysterically crying. It was amazing – the moment that every girl waits for."
So, the families were in on it? "My mom was on cloud nine all day," Lauren says. "I was wondering why she was so happy."
Scalia also put plenty of thought into the ring, getting designer Yanina – Lauren's jeweler since she was 17 – to create the diamond sparkler with white and rose gold accents.
"I remember seeing the ring, and I couldn't believe he pulled off what I always wanted," Lauren says. "I am obsessed with it. I don't know how many carats it is because he won't tell me, but when I go out to eat with my friends I make them wear it, so I can see what it looks like."
And now, of course, the planning begins for a wedding that will probably happen next summer – perhaps at the church at Fordham University, where Scalia went to school. "It's gorgeous," says Lauren of the chapel.
"[My mom] saw a dress already and she was like, 'You have to try this on,' " Lauren adds. "I want the bridesmaids to wear wedding dresses, too. Mine will be snow white, and they will be in ivory or cream," she said.