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Robert Kamau/GC Images, 247PAPS.TV / Splash News
The pair were spotted attending a Grammys after-party at 1Oak in New York. While the two were photographed outside the big bash separately, a source told E! News they were "coupled up" all night.
"Rihanna and Hassan showed affection throughout the evening," the insider said. "It was cool because he can roll with Rihanna, he fits in great."