Sammi "Sweetheart" Giancola

Jersey Shore Break Up!
Surprise, surprise: According to a source for FOX411.com, turbulent 'Jersey Shore' couple Sammi "Sweetheart" Giancola and Ronnie Ortiz have broken up -- again.
"Sammi was having a fantastic time at her Bon Voyage party on April 16th -- and Ronnie was nowhere in sight. They're completel…