Latin America's first gay marriage law is now in effect.  The Mexico City Legislature approved it in December.

On Thursday, gay and lesbian couples were able to register for the first time. The law, however, only applies to Mexico City residents.  But a marriage performed in one Mexican state must be recognized by the rest of the country.

The first gay weddings are scheduled to take place in the next 10 days after paperwork is completed. 

The government is challenging the new law on constitutional grounds in Mexico's Supreme Court.  The law remains in effect while the case is on appeal.

The Roman Catholic Church has severely criticized the law, which allows gay couples to adopt children.