NEW YORK — The internet’s most buzzworthy celebrity pairing is official. Pete Davidson has publicly labeled Kim Kardashian his “girlfriend” for the first time. “I don’t have Instagram or Twitter or any of that stuff. So, most of my daily life is getting into cars and showing up to a set,” the “Saturday Night Live” star, 28, told “People (The TV Show!)” host Kay Adams. “Or, if I’m off, I just either hang with my friends or chill with my girlfriend inside. So I don’t do much.” Staten Island native — and “King of Staten Island” star — Davidson and Kardashian, 41, shared a kiss during a “Saturday …