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The Center Dinner 2013 Gala

A chance encounter on a New York City sidewalk in 2004 led to sparks between Neil Patrick Harris and David Burtka. "We met on Ninth Avenue between 44th and 45th, through a friend of ours. That was it," the "How I Met Your Mother" star, 40, told New York magazine in 2010. Now the parents of 2-year-old twins Harper and Gideon, the couple has long been engaged — Burtka, 38, popped the question on the street corner where they met! — but they have been waiting to make it official in California. But don't expect them to run down the aisle right away. "We contemplated getting married in California before the Prop 8 debacle, and I opted not to immediately because I didn't want it to be a media event. I didn't want to go marching down the street with camera crews. Oy. To get married? Really? It seems like you have an agenda when you do it that way," he told Details in 2011. "I wouldn't want to get married to be an example."

Gay Celeb Couples Celebrating Marriage Equality Ruling

Check out a few of the same-sex couples in Hollywood who can now officially tie the knot.