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The "Come & Get It" singer took to Twitter to remember her beloved friend, whose sudden passing on Saturday has left Hollywood in a state of shock.
The two had costarred in 2011's Monte Carlo, and on Sunday, Gomez posted an affectionate tweet about Monteith as she shared her grief.
"This hurts. I love you Cory. Rest in peace. My thoughts and prayers are with you and your family," she wrote.