Where no new housemates have been added to the show? Every housemate that has been in the house this year started out on Day 1. Correct me if I'm wrong but I don't believe this has happened before?

BB13 and BB14 didn't have anyone enter half way through.

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True, but they didn't enter on the first night.

They couldn't wait to get rid of those they got, let alone the nearly chosen to chuck in later.