The actress quickly deleted the candid snap and has since apologised to her fans.
But it appears she's less than devastated about the slip-up, writing, "Yep. That picture happened. Ugh. My tech issues have now reached new heights, apparently... How a deletion turned into a tweet."
And Baruchel found the topless tweet hilarious, writing, "My fiancee is an hilarious dork," and adding, "Smartphones will get ya."