Who is the most notorious neighbor you can think of? We'd have to say Justin Bieber. The singer has made major waves for his neighborly antics while living in Calabasas, but he's since sold his former mansion and now he's scored a new chic apartment in Beverly Hills. Bieber is renting two penthouse units on a quiet, tree-lined street in a luxury condominium building—so it seems like this setup would be perfect for parties that last way, way past the midnight hour.