Over the weekend, 2NE1 held their anticipated “Welcome Back” series of concerts. They proved to be the “idols of idols,” as their loyal fans and many celebrities showed up to support them. Many celebrities, including worldwide stars and idols, sent video messages congratulating 2NE1. G-DRAGON congratulated 2NE1 for their #WELCOMEBACK_2NE1 concert, along with other K-Pop…