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A teenager rumored to be Russian president Vladimir Putin’s secret love child has abruptly stopped posting on social media — sparking concerns from her followers that she may have been gagged. Luiza Krivonogikh, 18, hasn’t posted anything on her Instagram account, which has amassed an 82,600-person following, for more than two months. Her frequent posts stopped suddenly after the teen and her 46-year-old mom, Svetlana Krivonogikh, started boasting on Instagram about their $4.1 million Monte Carlo penthouse apartment, The Sun reported. The penthouse they posted photos of and gushed about on Instagram was detailed in a trove of leaked “Pandora Papers” documents in October. Luiza’s mother, who has…