ST. PAUL (AP) — Gov. Mark Dayton says he will sign a bill legalizing gay marriage in a ceremony on the Capitol steps on Tuesday.

The governor's staff announced his plans just moments after the state Senate passed the bill Monday. Dayton will sign the bill at 5 p.m. with legislators and supporters on hand.

Gay couples will be able to get married in Minnesota starting Aug. 1. The state will become the 12th to make gay marriage legal.

The Senate passed the bill 37-30, with just one Republican crossing over to support it. Three Democrats voted against the bill, which passed the House last week.

The city of St. Paul is ready to throw a party to celebrate the legalization of gay marriage in Minnesota.

St. Paul city officials announced an outdoor concert right after the signing at a downtown plaza with more than a half-dozen performers. They're calling it the "Love is Law" concert.