Sydney Hardeman , who went viral for her stunned reaction to Beyoncé 's 2018 Coachella set, is dead ... TMZ has learned.

Sydney's mother, Jamie Hardeman , tells TMZ ... Sydney died by suicide.

We're told Sydney took her own life last Saturday. She was engaged and set to be married this upcoming April.

Sydney was a huge fan of the "Halo" hitmaker and even won an award her senior year of high school after she performed a dance medley to her songs. She went viral in 2019 when she was just 19 years old -- her reaction to Beyoncé performing at Coachella was included in Bey's Netflix documentary, "Beyonce: Homecoming" ... and she quickly became a meme. Gallery Launch Gallery Getty

The family says Sydney played basketball from childhood and through college, and then worked a

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