Out of the boys, Alex will probably be up for eviction. His cleanliness obsession is starting to annoy other housemates. I don't think PJ will get nominated as he seems to be keeping a low profile and does not annoy the housemates
The girls are a bit more tricky. Alison is becoming less amusing and ever so slightly more irritating with her explosive laughter and her 'wicked' saying. Adele may be nominated so that Lee and herself are split up before things get too out of control (conversely, Lee may be up for eviction).
Foreign BB's have shown how other housemates notice these little liasons and tend to nominate one or the other of the pairing for eviction.
At the end of the day, it doesn't matter how we perceive them, it's how they are perceived from the inside - Nasty Nick from BB1 is a case in point. The housemates 'loved' him when we all knew he was a skumbag!