12-31) 20:31 PST San Francisco - -- San Francisco Mayor Gavin Newsom and his girlfriend, actress Jennifer Siebel, became engaged in Hawaii over the weekend, knowledgeable sources said Monday.
One of Newsom's closest friends, high society party planner Stanlee Gatti, confirmed the engagement. The mayor's spokesman, Nathan Ballard, said the mayor popped the question on Saturday.
"Jennifer told me (about it). She was on the phone first, and then he got on the phone," said Gatti, reached in Raton, N.M., where he was on vacation.
Gatti had no details about the proposal, other than that Newsom spoke with his girlfriend's father first and then proposed marriage. No wedding date has been set, Gatti said.
It will be the second marriage for Newsom, 40, one of the Bay Area's most eligible bachelors, and the first for Siebel, 33. In December 2001, Newsom married lawyer and TV commentator Kimberly Guilfoyle in a lavish wedding at St. Ignatius Church followed by a reception for 500 at the home of billionaire philanthropists Ann and Gordon Getty.
They divorced in March 2006. Guilfoyle has remarried and lives in New York City, where she hosts "The Lineup" on Fox News.
Before meeting Siebel, Newsom briefly dated "CSI: Miami" star Sofia Milos. Siebel, an aspiring Hollywood actress, was raised in Ross, where her parents still live, and attended the private Branson School preparatory school and graduated from Stanford University, where she also earned a graduate degree in business.
She has traveled around the globe to work with Conservation International, an environmental group. Her father, Ken, is an investment manager. Her mother, Judy, co-founded the Bay Area Discovery Museum in Sausalito.
Newsom's mother, Tessa, died in 2002. His father is retired Judge William Newsom.
The couple met on a blind date at the Artists Ball at Yerba Buena Center in October 2006. Mutual high-society friend Kathy Wilsey set up the meeting. The theme was "Stanlee's Brain," a spoof on Gatti, one of high society's most sought-after party planners known for his extravagant stagings.
"I actually think they were made for one another," Gatti said. "You know the kind of thing where people finish each other's sentences? They do. Yet they're respectful of each other. They're pretty in sync with the way they feel about some things."
Siebel told The Chronicle last year that she knew little about Newsom when they met, except that her parents supported him and that he was a politician with aspirations. Even so, they hit it off right away.
"We had so much in common, we were blown away - from our love for Africa to our interests in political issues to art and the wine business and college sports," she said.
As political couples go, they've already weathered the biggest scandal of his career to date. Three months after they met, Newsom's campaign director, Alex Tourk, resigned after learning that the mayor had had an affair with Tourk's wife, Ruby Rippey-Tourk, who worked as Newsom's appointments secretary.
The affair ended before he met Siebel and reportedly occurred while Newsom was getting a divorce from Guilfoyle. Rippey-Tourk confessed the affair to her husband during rehabilitation for substance abuse. Newsom acknowledged the relationship had occurred, apologized, admitted to having a drinking problem and said he would seek counseling from Mimi Silbert of the Delancey Street Foundation, a drug rehabilitation program.
He told The Chronicle at the time that he had "come to the conclusion that I will be a better person without alcohol in my life."
The mayor's colleagues at City Hall had nothing but compliments for Siebel.
"Jen is lovely, smart and kind," Ballard said, "and we're very pleased that she and the mayor are tying the knot."