is celebrating its tenth anniversary this year, and the stars aligned for some epic performances on the season 20 finale — including a familiar face!Adam Levine is making his return to stage on Tuesday, as Maroon 5 is set to perform their latest single, «Beautiful Mistakes.»But prior to the performance, Blake Shelton kicked off the show by welcoming Adam back with a silly pre-taped skit about how much he had missed his old pal on and couldn't stop texting him about his return. «I'm so glad to