Alessandra Ambrosio and Jamie Mazur at the Udi's Gluten Free Table Credit: Gustavo Caballero/Getty Images

Alessandra Ambrosio and her fiance Jamie Mazur are still very much together, despite reports that the two are trying out a trial separation.

"It's not true, they are still happily together," her rep confirms to Us Weekly.

Though the couple are still in tact, they have hit rough patches in the past just like any other couple. "They definitely have a roller coaster of a relationship," an insider previously told Us.

Ambrosio, 32, and Mazur got engaged in 2008 after three years of dating and were spotted together as recently as Tuesday, Oct. 15, at the Day by Day fashion show in L.A. The pair have two children together -- daughter Anja, 5, and son Noah, 17 months.

(The brunette beauty previously shocked many when Us exclusively revealed in December 2011 that she walked the Victoria's Secret Fashion Show runway two months pregnant with her baby boy.)