With a $150 million divorce looming, Madonna couldn't resist launching a thinly veiled attack on her soon to be ex husband Guy Ritchie as she took to the stage in Boston last night.

Before she sang 'Miles Away', which Madonna previously claimed was inspired by Ritchie, she told the audience: 'This song is for the emotionally retarded. Maybe you know some people who fall into that category. God knows I do.'

The lyrics hint at a couple growing apart: 'When I'm gone you'll realise/That I'm the best thing that happened to you.'

She also opened the show, which took place just hours after her spokesperson confirmed the split, with her track I'm Not Sorry, telling the 20,000-strong crowd: 'That's right, I'm not sorry.'