Dd1 speaks both English and German very well now (she's nearly four). But the hilarious thing is that she speaks German with an English accent. Really makes me laugh - and I wonder where she gets it from? The only people she speaks German with (myself and my family when we're in Germany) certainly don't have an English accent!
DS speaks English and Italian without an accent and Portuguese with Italian inntonation but if he doesn't know a word in Portuguese he says it in English with a Portuguese accent. That goes for names too, you should hear him say Buzz Lightyear in Portuguese, it cracks me up.