Beyonce is finally breaking her silence on the crazy lip-syncing controversy that broke earlier this week ... kind of ... by posting a picture of herself online with the message "Can I live?"

Beyonce -- who has yet to address the allegations she faked her way through the National Anthem on Inauguration day -- posted the cryptic snapshot on Instagram Saturday night.

Bey is seen wearing a sweatshirt -- while practicing for her upcoming Super Bowl gig -- which poses the question "Can I Live?" ... the title of a song by her husband, Jay-Z.

It's clear from the pic ... either Beyonce is telling the world to back the heck off ... or she's just a totally supportive wife.

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