Ozzy Osbourne bought ''300lbs of ice'' during last week's heatwave.

The former Black Sabbath rocker had a ''brilliant idea'' to have a truck load of frozen water delivered to his house in Los Angeles, California, so that he could slip it into his pool and have a nice refreshing dip after the city was hit by scorching temperatures a few days ago.

Taking to her Instagram account, Ozzy's wife Sharon uploaded a photograph of her spouse standing beside his ice and captioned it: ''Ozzy's brilliant idea to cool the pool during last week's heatwave.''

But his bright idea turned out to be a flop as the pool was only three degrees cooler in the end.

Sharon added: ''3000 lbs of ice = 3 degrees cooler (sic).''

Meanwhile, Ozzy - who has battled drink and drug addiction in the past but has been sober for five years now - has been trying hard to exercise regularly and now feels healthier than ever.

Discussing his upcoming 70th birthday in December, he said recently: ''It's only a number and I don't know how a 70-year-old person is supposed to act but I feel better at 70 than I did at 50.

''I've been clean and sober for five years now. I work out every day.

''One specification in my rider to hotels is that I have a piece of apparatus in my room, an elliptical cross trainer. I can just get out of bed and work out. I love it! I'm not trying to look like Arnold Schwarzenegger you know, just trying to keep my heart healthy. It's so nice when my doctor goes, 'Wow! You've got the heart of a 21 year old' . . . even if I have got the brain of an older person!''

At the height of his wild partying, the 'Paranoid' singer was convinced he'd be dead before the age of 40 - but once he neared that milestone, he was determined to live longer.