Brian, who found fame with the boy band in the 90s, has uploaded the short clip to YouTube and it shows him destroying the prestigious discs in an alleyway.
The framed award was presented to the group for selling a staggering one million records, however Brian blasts the music industry after smashing them to smithereens.
Preparing to ruin the memorabilia on a metal electrical box, he begins by ranting: "East 17, one million sales, this is what it f***ing means."
Once finished, 40-year-old Brian gives the shattered frame a kick up the alley before storming up to the camera and yelling: "That's what I think of your f***ing music industry."
This is just one of a few worrying videos Brian has posted online. Another shows him throwing the glass and gold discs in the bin while saying: "I'm a peaceful person and I pick my rubbish up. I can be angry and tidy."
Brian was just a teenager when East 17 hit the big time in 1992, however the band was plagued with controversy due to their seemingly wild behaviour.
Lead singer Brian was eventually sacked after appearing to condone the use of ecstasy during a Radio 1 interview, although he rejoined when the band rebranded themselves E-17 in 1998.
In 2005, Brian suffered serious injuries after accidentally reversing his Mercedes over himself. More recently, Brian found himself in the headlines after turning up at 10 Downing Street with a ring binder folder and demanding to see Prime Minister David Cameron.
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