May 19, 2010 at 06:02 PM EDT

Image Credit: Michael Courtney/The CWDiscretion and restraint are clearly not among Tom Welling’s superpowers.

The CW was hoping to announce at its upfront presentation Thursday that next season of Smallville — the show’s 10th — would be its last. But Welling — who was expected to deliver said announcement in person — jumped the gun and blabbed it to the press last night.

“Season 10 of Smallville will be the last season,” Welling told last night at an event in Beverly Hills.

That noise you hear is Dawn Ostroff frantically searching for her blue kryptonite dagger.

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