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 completely and totally over," the source said.

And apparently, Sammi has already moved on. "Two guys from the San Diego Chargers were totally flirting with her and she was definitely enjoying the attention," the source added.

The on-again, off-again couple has had their fair share of fights over the years, most recently during the season 3 finale, when Sammi punched Ronnie in the jaw.

'Jersey Shore' season 4, which will take place in Florence, Italy, is expected to premiere later this year.

[FOX411.com]