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The JLS star is selling possessions to raise money for Multiple Sclerosis sufferers.
The Love You More star has been caring for his mother, an MS sufferer, since he was 12 and as an ambassador of the MS Society he's looking to help out with funding.
In a recent interview Ortisé revealed the impact his mother's condition had on his family's life.
"I felt scared and alone because I never really knew what it was or how it would impact our lives", he told The Sun. "I was the oldest and soon became the man of the house and my mum's carer. I also had to take care of my two brothers and little sister who was 3 at the time."
"I would do the school run in the morning, make dinner at night and everything in between. I grew up fast - but I had to get on with it, just like every one of the 175,000 young carers in the UK today."
"The MS Society is the UK's largest charity dedicated to people affected by MS. They provide a free helpline, fund vital research and offer information and support to people affected by MS."
He continued: "They also do a lot of work with young people who care for relatives and now have a special Guide For Young Carers. This is why I am auctioning off some of my prized possessions for them - to help them continue their great work."
"I've been meeting carers involved with the MS Society backstage at our shows. It's been emotional meeting young people who are going through exactly what I was but it keeps me grounded. I like to think I'm taking their minds off what's happening at home, even just for one night."
Some of the items being auctioned off on eBay include Williams's "lucky" Superman pants, a yellow hoodie and his favourite Michael Jackson T-shirt which he's worn during live shows.