The star was joined on the steps of Glasgow Royal Concert Hall by 80 women from West of Scotland and Edinburgh Garrison military wives' choirs.
The choirs performed a special version of M People's Smile to the watching crowds.
Susan said: "My father served in the Second World War so the Scottish Poppy Appeal is a cause close to my heart. The money raised means that Poppyscotland can provide much needed support to thousands of veterans and, of course, their families.
"The armed forces community today really needs our support and I hope the Scottish public will get behind the 2012 appeal and give as much money as they can."
Both choirs, formed by women whose husbands and partners are now serving in the armed forces, have received help from Poppy Scotland.
Poppyscotland chief executive Ian McGregor said: "The Scottish Poppy Appeal is vital. The demands on our services are growing and show no sign of diminishing.