The pair got engaged in January 2011 after dating for eight months.
In a statement to British Vogue, a rep for Petra’s agency, Next Models, said: “Petra Nemcova and Jamie Belman confirm their separation. They remain close friends and thank their families for their continued support during this time. There will be no further comment on the matter.”
Petra and Jamie were planning to marry in June, saying last summer she was planning to wear a Marchesa gown.