Paul Sakuma, Associated Press
Mayor Gavin Newsom

It looks as if San Francisco is about to lose its most eligible bachelor.

Mayor Gavin Newsom, 40, proposed to his girlfriend, actress Jennifer Siebel, 33, while they vacationed over the weekend in Hawaii, and she accepted, said Stanlee Gatti, a friend of the couple who spoke with the mayor after he proposed. A date has not been set, Gatti said.

It would be the first marriage for Siebel, 33, and the second for Newsom, whose four-year marriage to Kimberly Guilfoyle ended in divorce in March 2006.

The two were introduced by mutual friends in October 2006. Siebel, who lives in Los Angeles, stood by Newsom after he publicly admitted in February that he had a drinking problem and had had an affair with a former staff member's wife.