Kevin Hart's got quite the potty mouth… digitally speaking.Recently, a humorous study out of the United Kingdom named the comedian the most "foul-mouthed celebrity" on Twitter, narrowly edging out former "Real Housewives of Beverly Hills" star Brandi Glanville for the, well, honor.The study, done by MrQ, examined the most recent 3,200 tweets from a gaggle of celebrities. MrQ used 10 fairly common vulgar words as its baseline, including variants.