Blake Shelton may be freaking out right now, as it's been announced that Cher will be his team's guest mentor when the Battle Rounds begin on 'The Voice' this season. The other three coaches' guest mentors were also revealed, just two weeks before the NBC series resumes.

Shelton is a big fan of Cher, partly because his late father was a very big fan. When Cher performed during Season 4, the 'Mine Would Be You' singer revealed that his Dad worshiped the singer. "I wish he could have seen tonight's episode, because I would've been texting him saying, 'Hey, I met Cher! I took a picture with Cher!'" Shelton told Reality Rocks (quote via Yahoo). "She's just as viable and important to music today as she ever was."

Cher also admits she's a fan of 'The Voice' and would have auditioned, had it been around before she became famous. Rounding out the guest mentors will be Ed Sheeran (Christina Aguilera), OneRepublic's Ryan Tedder (Adam Levine) and Miguel (Cee Lo Green). The original coaching cast reunites this season after Shakira and Usher replaced Auguilera and Green last season.

Season 5 of 'The Voice' begins on Sept. 23 on NBC.