Martin, 44, and Yosef walked hand-in-hand on the red carpet wearing black tuxedos.
The Grammy Award winner almost confirmed his relationship status on Instagram by posting a photo of two of them. "Yup" he captioned the picture.
Yosef, 32, also shared a photo and wrote, "We cleaned up good. THANK YOU @amfar for an amazing event @riccardotisci17 ph: @lecovianaphotos"
Painter by profession, Yosef, was born in Syria and now lives in London.
Martin, who is a father to seven-year-old twin sons Matteo and Valentino, was in a relationship three-year relationship with Carlos Gonzalez Abella, whom he split from in January 2014.
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