Dylan Efron is Team Ashley Tisdale all the way! The Traitors alum appeared on What What Happens Live with Andy Cohen on Wednesday, where a fan asked him about the drama between the Disney Channel actress and her former mom group. Ashley - who starred in the High School Musical franchise with his brother Zac Efron - penned a scathing article for The Cut earlier this month about breaking up with her "toxic" group of mom friends. She didn't name names, but we all quickly figured out that the mom group involved Mandy Moore, Hilary Duff, and Meghan Trainor.