I've only watched this a couple of times and only because there was nothing better on but I couldn't help but notice how some of the housemates look like certain celebrities.
Jessica looks like the pop singer Anastascia.
Mirabai looks like movie star Christina Ricci.
Damian (face) looks a bit like Mal Meninga (ex Canb Raiders player). It's the mono eye brow thing.
Sarah looks a bit like Meg Ryan.
Shannon looks a bit like Lisa Curry-Kenny (ex Ironwoman) or Kerry Saxby-Junna (ex Olympic walker).
Nathan of course looks like Gordon from last year's BB.