Avril Lavigne was left thinking "What the Hell" during a concert in Brazil this week -- after a fan rushed her on stage!

The singer was about to start singing a cover of Coldplay's "Fix You" on Tuesday night when a wild fan ran at her with her arms spread -- scaring Avril, who let out an audible shriek.

Security swooped in and she quickly recovered, telling the crowd "It's all good ... let's try that again."

One fan captured the moment and posted it on YouTube -- check it out above.

For a closer view, check out this video too.

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