The state's General Assembly on Thursday voted 42-33 in favor of the measure, following the Senate's approval earlier this week. The measure is now to be sent to Christie on Friday.
Christie, a rising star in the Republican party who supports White House hopeful Mitt Romney and has been mentioned as a possible vice-presidential candidate, has repeatedly said he will not approve the bill.
"I am not a fan of same-sex marriage," Christie said in a recent television interview.
"It's not something that I support. I believe marriage should be between one man and one woman. That's my view. And that'll be the view of our state because I wouldn't sign a bill like the one that was in New York."
Christie has said he would support a referendum on the issue.
So far, seven US states -- Connecticut, Iowa, Massachusetts, New Hampshire, New York, Vermont and Washington -- and the District of Columbia have legalized same-sex marriages.
A group of 80 US mayors -- including New York's Michael Bloomberg, Chicago's Rahm Emanuel, Antonio Villaraigosa from Los Angeles and Annise Parker from Houston -- last month unveiled a campaign to win support for same-sex marriage.
Gay marriage was briefly authorized in California in 2008, but later banned by a referendum re-writing the state's constitution to restrict marriage to unions between a man and a woman.
A US federal appeals court earlier this month declared the California ban on same-sex marriage unconstitutional.
Opponents are expected to appeal, and the legality of same-sex marriage will likely be decided by the US Supreme Court.
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