Michelle Obama is obsessed with 'Downton Abbey'.The US First Lady loves the ITV drama series so much her office got in touch with the British network to ask if they could send over the DVD of the third series as it is not due to air in the US until January. A source said: ''We know it's very popular in America as it's so quintessentially British. We'd heard the Obamas liked to watch it but we were very surprised when someone from the First Lady's office got in touch asking for the series.'' However, ITV were keen for Michelle to ensure she did not reveal any secrets about the series, which features a wedding and a death. The source added to The Sun newspaper: ''They were very polite and we were more than happy to sort out some DVDs for them to send over. Obviously we hope they keep the spoilers to themselves as our US fans may not know about ... well, you know what!'' The third series ended in the UK this month.