Ariana Grande is seeing Saturday Night Live comedian Pete Davidson, E! News has learned. "It just started and is casual," a source says.Coincidentally, their budding relationship comes soon after both Ariana and Pete ended previous relationships. The "No Tears Left to Cry" songstress confirmed her split from rapper Mac Miller earlier this month. Likewise, news broke just last week that Davidson and Cazzie David had broken up after two years together.The source explains that despite Ariana and Mac officially breaking up after attending Coachella in April, "the relationship had been over long before."