British pop star Pixie Lott composed a song in honour of her sister's wedding and performed the special piece as a surprise during the big day.

The Mama Do singer acted as a bridesmaid when her sibling Charlie-Ann married her boyfriend Che Smith in August (13), and Lott has now revealed she put her musical skills to use by singing a specially-written song at the wedding in Essex, England.

She tells Britain's You magazine, "It was a surprise, but she probably knew I was going to do it."