The former Pop Idol winner sang at last night's event in the town hall.
McManus has been learning the language for two years, taking evening classes at the Gaelic School in Glasgow. While there, the Glasgow-born star has been helping out with young children so she can be fully immersed in the language.
McManus said: "It is something completely different from everyday life, and a good hobby to have.
She added: "It is an amazing gift to give a child a language. Gaelic is so accessible here, compared to learning French or Spanish where you need to get on a plane to speak it properly.
"They can come home and watch the cartoons on BBC ALBA or listen to the music on Radio Nan Gaedheal."
She also praised Paisley Abbey as an "amazing venue" for the annual Gaelic music festival.
Meanwhile, the statutory language body Bòrd na Gàidhlig is to redevelop its teacher recruitment campaign.
The Minister for Scotland's Languages, Alasdair Allan, said: "The Bòrd has had great success in attracting teachers to Gaelic-medium education."