Okay, so full disclosure here -- we don't get it. We're not really sure why a French Soccer star just made love to a chicken on his Instagram, but he did ... and we're about to show it to you. The guy's name is Patrice Evra, and he's an international soccer superstar, who used to play with…

French soccer superstar Patrice Evra was in L.A. during the horrific terror attack in Nice Thursday ... but tells TMZ Sports he's crushed over the situation ... and sad for the future. The 35-year-old -- who just played with France during the 2016 Euro Cup -- was leaving Mr Chow in Beverly Hills…