Hailey and Justin Bieber are continuing to beef with TikToker Julie Theis ... slapping her with a cease-and-desist letter that claims she fabricated her story about their celebrity marriage. TMZ obtained a copy of the letter written by the Biebers' attorney Evan Spiegel ... who writes that Theis posted "outrageous false, fabricated, and defamatory" statements online about the couple's marriage. Spiegel also writes Theis uploaded TikTok and Instagram videos of herself claiming that Justin and

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