BEVERLY HILLS - The era of gay marriage in California will begin today with the Beverly Hills wedding of two lesbians whose court struggle led to the lifting of the state's ban on same-sex unions.

Robin Tyler and Diane Olson, who had been repeatedly rejected at the Beverly Hills Courthouse in their requests for a marriage license, will return to the building this afternoon and become the first couple in Los Angeles County to receive a same-sex license and get married.

"We're going back to ground zero in the same-sex marriage lawsuit," Tyler said.

In 2000, 61.4 percent of voting Californians approved Proposition 22, which stated that only a marriage between a man and a woman is sanctioned by the state. Gay couples who were denied marriage licenses in Beverly Hills, San Francisco and other areas sued.

In a 4-3 decision, the state's high court ruled last month that the proposition was unconstitutional because it discriminated against gays and did not provide them with equal protection under the law.

Most gay couples will not be able to obtain marriage licenses until Tuesday morning, but "in recognition of their unique role in the court's decision," Olson and Tyler will receive their license today and be permitted to wed, according to Dean Logan, acting Los Angeles County registrar- recorder/county clerk.

A similar arrangement was made for a San Francisco couple that also was a party in the original lawsuit.

Olson and Tyler will arrive at the Beverly Hills Courthouse in a limousine at 4 p.m.

and begin applying for the license, which will be issued at 5:01 p.m.

Between 50 and 75 invited guests, including Beverly Hills Mayor Barry Brucker, are expected to attend the wedding ceremony, which will be performed by Rabbi Denise Eger immediately after the license is issued.

Following the wedding, the couple's attorney, Gloria Allred, will host a dinner for the couple and their families at L'Ermitage. The wedding ceremony and dinner will be open to members of the media.

The onslaught of same-sex couples seeking marriage licenses is expected to begin Tuesday. In West Hollywood, a ribbon-cutting ceremony will be held at 9 a.m. at the West Hollywood Park auditorium, 647 N. San Vicente Blvd., to mark the beginning of the licenses being issued.

Gay couples can then apply for licenses and get married in civil ceremonies.

A rush of same-sex couples to the altar could be a boon to the economy in Los Angeles and across the state, according to a UCLA study.

The study, released earlier this month, estimates that nearly half of California's 102,600 same-sex couples will marry over the next three years, and that they and same-sex couples from other states will spend more than $683 million on their weddings, honeymoons and other marriage-related activities.

The report estimated that California same-sex couples will spend about $392.3 million on weddings over the next three years; marriage license fees for same-sex couples will generate $8.8 million for counties; and wedding spending will result in 2,100 new jobs in the state.

In addition to the estimated 60,000 same-sex California couples expected to marry, as many as 68,000 out-of-state gays, including 12,000 from New York alone, are expected to come to California this summer to exchange vows, according to the study.

Unlike Massachusetts, the only other state to sanction same-sex marriages, California will allow nonresidents to wed. However, the federal government still does not sanction same-sex marriages, and the General Accounting Office has identified 1,138 federal benefits and civil marriage rights that will not be extended to gay couples.

Southland same-sex couples can obtain marriage licenses beginning at 8 a.m. Tuesday at the county Registrar-Recorder/County Clerk headquarters at 12400 Imperial Highway in Norwalk. Civil ceremonies will be held on a first- come, first-served basis.

Marriage licenses can also be obtained beginning at 8:30 a.m. Tuesday at county clerk offices at:

-- 1028 W. Avenue J2, Lancaster;

-- the Beverly Hills Courthouse, 9355 Burton Way;

-- the Airport Courthouse, 11701 S. La Cienega Blvd, sixth floor;

-- 4716 E. Cesar Chavez Ave., East Los Angeles; and

-- 7807 S. Compton Ave., room 215.

The clerk's Van Nuys district office is closed for remodeling.

Voters in November will decide on a proposed constitutional amendment that would again ban gay marriage. It was unclear what the passage of that measure might have on gay couples who are married in the interim.