EXCLUSIVE: Jennifer Lopez Is All Smiles While Filming 'Love Make the World Go Round' Video With Lin-Manuel Mir

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Jennifer Lopez and Lin-Manuel Miranda are finding some light in the dark.
The duo's collaboration, "Love Make the World Go Round," sprung from tragedy -- they recorded it as a tribute to the victims of the Pulse nightclub shooting in Orlando -- but they were all smiles while filming the music video in New York City on Friday.
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The video shoot took place on the rooftop of the Richard Rodgers Theatre -- the same theater Miranda's Broadway hit, Hamilton, plays! So, the single isn't just for a good cause -- proceeds going to the Hispanic Federation's Proyecto Somos Orlando -- there's a Hamilton connection!
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On the track, Miranda raps, "What we got is love even when the sinners hate us / We cannot let them diminish or intimidate us / We sing out, we got the rhythm and the truth on our side / We cut through the divide and we do it with pride."
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An eyewitness tells ET, "As the shoot went on, more and more fans arrived and it began to get really crazy. The theater is by Times Square, so of course everyone just started gathering and it got insane."
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J.Lo wore a colorful halter top and low-rise jeans that showed off her flawless six-pack for the video, and we're told she was "really cool, happy, waving to fans, jumping around, and very energetic."
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"You could tell considering everything going on right now that they were emotional because of the song's deep meaning," the eyewitness said. "But they kept the vibe upbeat and positive."
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A day after the worst mass shooting in U.S. history -- where 49 people were killed at Latin night at a gay bar in Orlando -- Miranda used his acceptance speech at the Tony Awards to pay tribute to the victims, saying, "Remember that hope and love last forever."
Watch the emotional moment in the video below.