The Insider.com

Jennifer 'Jwoww' Farley and Sammi 'Sweetheart' Giancola

 These frenemies have done a lot of hair pulling! JWoww and Sammi have got into two fights on their reality show "Jersey Shore," stemming from JWoww writing an anonymous letter to Sammi, revealing that her boyfriend Ronnie Ortiz-Magro was running around with other girls. However, the two did reconcile in the third season of the show, but Sammi later moved out of the house.