"Jersey Shore" star Sammi "Sweetheart" Giancola and her baby daddy Justin May said "I do" in New Jersey yesterday ... and TMZ has all the details on how it went down. Gallery Launch Gallery Instagram

Sources tell TMZ ... the entire 'JS' cast was there except Sammi's ex, Ronnie Ortiz-Magro -- probably for the best to avoid any blowups. But it still wasn't drama-free!

We're told Angelina Pivarnick was really "going through it" at first, because the venue -- Park Chateau Estate & Gardens -- was the same place she got married in back in 2019.

Things got better, though ... according to our sources, "a lot of guys were hitting on her and she ended up catching the bouquet."

As for the rest of the cast ... we're told they had a great time partying and drinking the night aw

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