morning. Right now -- "Morning megameme." A defining cultural happening right this minute. I'm so curious. Did you say his name? That's Marvin. That's Marvin. He's a supermemer. And the news we're... See More
morning. Right now -- "Morning megameme." A defining cultural happening right this minute. I'm so curious. Did you say his name? That's Marvin. That's Marvin. He's a supermemer. And the news we're talking about all day. Things that keep the Twitter sphere all agog for a day. A two-for this morning. A wonderful moment. A megawedding, if you will. Right near the end. A top trend of Facebook and Twitter overnight. Take a look. ♪ When I was in the third grade, I thought that I was gay ♪ the most touching moment of a memorable night. Macklemore & Ryan lewis singing "Same love" and inviting 33 couples to get married while they performed. Madonna and queen latifah. We're gathered here to celebrate harmony. It is my honor to ask the participants to exchange rings. Do you each declare you take each other as spouses? By the power vested in me by the state of California, I now pronounce you a married couple! Reporter: The couples were a mixed group. Gay and straight. Old and young. The song was written to support the legalization of same-sex marriage. Madonna serenaded them with her song "Open your heart." ♪ Open your heart to me ♪ Reporter: And emotional audience rose to its feet, even Katy Perry was in a celebratory mood, taking a bow Kay from one of the couples. That performance ended a big night for macklemore and lewis. They took home four grammys. First and foremost, I want to thank our fans. The people that got us on this stage. Reporter: But, they say, the best award of all is being part of history. ♪ We have to change us whatever god you believe in we come from the same one ♪ And for those that don't know, macklemore wrote that song inspired by his uncle who has been with his partner for many, many years. A terrific moment. I never thought it would be better then when they sang it here. The other big moment of the night. It was big. Oversized to be sure. Pharrell Williams. And the greatest hat I have ever seen. Had a very large fedora. He's the coolest dude ever. He made an appearance and the hat took on a life of its own. It had its own Twitter account. And immediate reaction from arby's. Hey, pharrell, can we have our hat back? Reminded me of curious George. I thought smokey the bear. I thought his head was just small. The mounties want their hat back, too. This morning, pharrell tweeting back, y'all ring to start a roast beef? And a big night for him. Congratulations to you and your hat. The biggest morning for us. Marvin, welcome to the ball club.
This transcript has been automatically generated and may not be 100% accurate.