Article continues below advertisementPresident Donald Trump revealed his shocking nickname for his son Donald Jr.'s ex-fiancée, Kimberly Guilfoyle, during a Greek Independence Day event at the White House on Thursday, March 26.Kimberly, whom Donald tapped as U.S. Ambassador to Greece, revealed to the group, which included an awkwardly laughing Archbishop Elpidophoros of the Greek Orthodox Archdiocese, that his "little pet name" for the 57-year-old ex-wife of California Gov. Gavin Newsom is "Kimber-lay.