She joined other celebrities to launch SCIAF's Lent appeal and revealed she planned to give up sweets for the season.
The Britain's Got Talent finalist said she'd give the money she saved from buying the treats to the charity.
Admitting she'll find it "very hard" to go without any sweets for the 40 days she said: "For many people, life is so tough that they dream of just having enough food to eat, being able to clothe their children and send them to school.
"I've been supporting SCIAF all of my life because I know that they help the poorest of the poor to have food and support themselves.
"This year, every donation given to the Wee Box appeal is being doubled by the UK Government, so everyone's help will go twice as far. I would encourage everyone to pull the stops out and really help SCIAF in every way you can."
The Wee Box appeal raised £800,000 last year.
SCIAF director Alistair Dutton said: "We're incredibly grateful to everyone for supporting our Lent appeal. Whether it's giving a donation, putting on an event, or filling a Wee Box with small change, every penny will be doubled.
"That means that we can help many more people to free themselves from hunger and poverty."
Other celebrities involved in the appeal include Scotland midfielder Darren Fletcher, Deacon Blue's Ricky Ross and former Rangers' manager Ally McCoist.