It must be in the genes.  At swimming lesson yesterday, as Anne was getting Izzy dressed and whilst she was semi-naked. Izzy started gyrating her naked backside ('bunda' in Portuguese) towards the young instructor, Eric, whilst signing 'Oh, yeah, oh yeah'.  Not sure where she gets this from - certainly not something that Anne does (unfortunately?!) - but it is a big part of Brazilian dance.  But at age 4, she should not really being doing it to good-looking swim instructors.  They's be coming to take her away!