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They were once tennis' inseparable golden girls but siblings Venus and Serena Williams' formerly close relationship is reportedly under strain. The tennis champions, who have won three Olympic golds together, have not been seen together off court in recent weeks and there has been speculation as to whether Serena's constant partying is to blame. According to the New York Post, the world number one's late nights and recent disappointing doubles performances have irritated her older sister - who is known for her more laid-back lifestyle.