Finally, a celebrity is speaking out about the Kristen Stewart/Rupert Sanders affair ... and he's DEVASTATED.

The hilarious Will Ferrell lamented the breakup of Stewart and Robert Pattinson last night on "Conan," where his emotion rivaled that of YouTube superfan Emma Clark.

While Farrell's was clearly a spoof of Clark's serious original tirade, it has him screaming "It's not going to be fine, EVER!" and gems like calling K-Stew a "trampire"

Somehow, we think Ferrell will find a way to go on.

Watch Emma's crazy video below:

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