The cast of Wicked at the film's LA premiereAriana Grande and Ethan Slater were caught in a very sweet moment when they joined the rest of the Wicked cast at the movie’s premiere on Saturday night.The pair famously got together while shooting the long-awaited movie musical, in which the chart-topping singer and Tony-nominated Broadway performer play Glinda and Boq, respectively.On Saturday night, they joined co-stars Cynthia Erivo, Jonathan Bailey, Jeff Goldblum, Michelle Yeoh, Marissa Bode and Bronwyn James at a screening of the film in Los Angeles.And while the couple remained in a group during the photocall – even keeping their distance from one another for most of the event – they did share a tender moment when Ariana was spotted fixing her boyfriend’s tie and smoothing down his collar in front of photographers.&