KELSEA BALLERINI and her crew went to Vegas over the weekend for her bachelorette party. She posted photos and videos that included bikini shots, mimosa shots, and a meeting with a superstar. But let's start with the plane ride. She posted a clip of herself hamming it up in the aisle and imitating Kristen Wiig's character in "Bridesmaids" In Vegas they got hooked up with tickets to see JENNIFER LOPEZ's show at Planet Hollywood where they got backstage and took selfies. Then they were poolside wearing "Bride Squad" bathing suits. That was captioned, "Friends that have matching wedgies together stay together." And props to Kelsea for a bikini shot while enjoying a burger and a mimosa.