The term "second lady" refers to the spouse of the Vice President of the United States, concurrent with the Vice Presidents term of office. The title was first used by Jennie Tuttle Hobart, wife of Vice President Garret Hobart, to refer to herself. The role of the second lady is unpaid and not formally defined, but traditionally, the wife of the Vice President of the United States was expected to serve as a hostess and appear at society functions. The public role of the second lady did not expand throughout the first half of the twentieth century, but recent second ladies have increased and expanded the role of the office. Twelve second ladies have gone on to become first ladies during their husbands terms as president, the first being Abigail Adams and the most recent being Jill Biden.