'World News Now' makeup artist Tinayn Mahler gets the shock of her life when anchor Rob Nelson suddenly directs her attention to the camera for a "special surprise." But Mahler's stage fright nearly derails the whole event.

In fact, the poor woman looks positively terrified, and when her fiance appears and proposes, things only get worse. Eventually, Mahler sinks to her knees and begins to sob. Um, that's a happy reaction, right? We can't tell.

Watch the emotional proposal (and Mahler's response) below.

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[ABC News]