Kelly Osbourne is firing back at critics who took aim at her appearance after she stepped out at the BRIT Awards ... making it crystal clear she's not here for the body commentary. Kelly hit Instagram shortly after the ceremony -- where she joined her mom, Sharon Osbourne , to honor her late father, Ozzy Osbourne . Instead of focusing on the emotional tribute, online trolls zeroed in on Kelly's noticeably slimmer frame ... and she says the cruelty crossed a line. In a scathing statement, Kelly

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