DD was 4 in August and started primary school in September. We were a bit worried about her starting school as she had displayed some bad behavior at nursery - hitting, wetting herself, occasionally biting. DH and I worked together and with her, to try and address the issues and things improved dramatically.
So her first parent's evening came round just before half term and the story isn't great. Essentially, she can't stand not being the centre of attention. If a teacher asks a question and she isn't called on to answer it, she shouts the answer out, or gets cross with the child who is chosen to answer. She pinches or kisses (!) children in assembly. She then answers back to teachers - when they call her out on her behavior, she tells them "No i didn't do [whatever it is they've just witnessed her doing]". Today it came to a head when she called one of the teachers a bitch in front of the class and the head called us in 
She is not an angel at home but her behaviour is never as extreme as it seems to be at school - by and large I don't have any problems with her. My husband thinks she may have some kind of behavioural or mental health issue, whereas I think it's attention seeking.
Either way - what can we do? She's only four - I don't want her to be the naughty kid 