Which language do Tiffany and Jessica of SNSD speak with each other?

I know both of them grew up in the US and that Tiffany has some problems with Korean. I'm wondering whether they're more comfortable speaking English when only the two of them are around. I also know that they spoke Korean when they were alone in Hello Baby, but that was, of course, for the show.|||They are both fluent in english and korean.|||I'd say they speak English with each other since Tiffany has some problems with Korean ^.^





Please answer mine!! :D





http://answers.yahoo.com/question/index?qid=20111108095009AAfYfgS