YUNGBLUD looked happy and unbothered with girlfriend Jesse Jo Stark ahead of his San Diego show ... stepping out together before taking the stage as part of his "YUNGBLUD: Idols World Tour," just days after Machine Gun Kelly stirred up online drama with comments about the singer. The singer spent some downtime with Jesse before the concert Wednesday afternoon at The Rady Shell ... keeping things low-key while gearing up for another stop on his North American run. MGK sparked the drama after