Royal bride's playful past: The twin brother with a very suspicious looking cigarette - and 'barboosin' maid of honour

Shown here in an exclusive Mail on Sunday picture smoking a distinctly suspicious looking cigarette, this is Chris Kelly.

The 30-year-old Canadian and his sister are said to be close, despite marked contrasts in their characters.

A family friend said last night: "Chris and Autumn are very different creatures. Whereas Autumn is outgoing, Chris, who is now a builder, is quieter and likes to keep his own company."

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More comfortable in the spotlight of yesterday's Royal wedding will have been the woman who Autumn chose as her maid of honour.

Jackie Aubie's name will have meant little to those who saw her demurely shepherding Zara Phillips and the other bridesmaids into St George's Chapel.

But in the small town of Pointe-Claire, near Montreal, where Jackie attended the same state school as Autumn, she is regarded as an apt – if unconventional – choice.

She and Autumn are as inseparable as twin sisters, according to friends, with a reputation for having fun.

Nowadays, they are both doing their best to settle into respectability, Autumn as the new wife of the 11th in line to the Throne, while Jackie, 29, works as a school psychologist.

But as older teenagers they were renowned for attending late-night drinking parties.

A friend said last night: "I find it hard to picture Jackie hanging out with the Royal Family because she's a very loud person. She loves to kid around."

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At Pointe-Claire's St Thomas High School, Jackie loved to shock her fellow pupils with adolescent humour – pulling faces behind people's backs – and was voted "funniest person" in a poll.

She also boasted in the 1995 yearbook that she liked to go out drinking with Autumn. Jackie alluded to their pastime as "barboozin".

A friend said: "In our yearbook Autumn joked that what she would remember about St Thomas was 'buving', which was our private word for drinking, and 'yee clan', which was what our group called cannabis. Some people in our crowd used it socially. Autumn smoked only cigarettes."

Another familiar with their school days added: "Autumn and Jackie were members of a group we called the Get Along Gang, which consisted of the most popular girls in the school."

Aptly, Autumn's nickname was "Princess Autumn".