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March: Christina Aguilera

When listing one house isn't enough, some celebs try for a daily double. Take Christina Aguilera, for instance. Aguilera is a high-income earner who can eschew standard real estate advice. In March, Aguilera listed her Beverly Hills home for $13 million while her Hollywood Hills home continued to linger on the market. While the Hollywood Hills mansion has since sold, Aguilera's Beverly Hills pad — previously owned by the Osbournes — hasn't wooed a buyer yet.

Credit: Zillow