Britney Spears' boyfriend is apparently infuriated with the pop stars' habits of wearing the same outfit for several days. Jason Trewick has reportedly ordered Spears to change her clothes more.

Yahoo! 7 News quoted a source that Spears 'hates washing her hair, so sometimes it can smell downright sour.' The source added that the singer 'sometimes grab an outfit and wear it two or three times in a week. 'The singer's boyfriend had recently refused to go out in public with her until she took off a dirty dress.

'Recently she put on a sundress for the third day in a row, but Jason refused to leave the house with her until she put on something else,' said the source.

But Spears is breaking the habit, the source continued. 'Thankfully she's trying more now because even she knows you couldn't think of a more embarrassing reason for a relationship to break down.'Britney was pictured in the same orange vest twice in the space of a few days and according to her friends, has always taken a lax attitude to her appearance. The source said 'It's just plain laziness. She was the same when she was married to Kevin Federline.'