Kelly Clarkson and Blake Shelton express shock at Adam Levine's sudden ...

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His sudden departure left NBC and his co-stars reeling.

And following the announcement that Adam Levine, 40, wouldn't return for season 17 of The Voice, his fellow judges have weighed in on his departure.

Kelly Clarkson, 37, and Adam's joke frenemy Blake Shelton, 42, took to social media to express their shock. 

Reacting: Kelly Clarkson, 37, and Blake Shelton, 42, both took to social media on Friday to announce their shock at Adam Levine's sudden departure from The Voice

Reacting: Kelly Clarkson, 37, and Blake Shelton, 42, both took to social media on Friday to announce their shock at Adam Levine's sudden departure from The Voice

Kelly revealed she'd been blindsided by the departure in a Friday Twitter post.

'Found out last night about @adamlevine leaving The Voice & while I get that he's been doing the show 4 a while & wants to step away, it will be weird showing up 4 work & he's not there,' she wrote. 'To start an amazing show from the ground up is a big deal!' 

Notably, the American Idol winner's statement avoided any positive words about Adam, instead sticking with a more detached tone.

 

Taking a bow: Adam announced his departure with little fanfare, reportedly after becoming disillusioned with The Voice's new format, which sidelined him in the final episodes; still from Tuesday's episode

Taking a bow: Adam announced his departure with little fanfare, reportedly after becoming disillusioned with The Voice's new format, which sidelined him in the final episodes; still from Tuesday's episode

Blake Shelton was notably warmer in his reaction to his friend's departure.

'Having a hard time wrapping my head around @adamlevine not being at @NBCTheVoice anymore,' he wrote. 'After 16 seasons that changed both of ours lives. I only found out about this yesterday and it hasn't set in on me yet. Gonna miss working with that idiot.'

The country singer and Adam had a joking report on the singing competition, often acting as if they didn't care for each other despite being friends.

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