The Canadian singer found fame at 17 with her hit Complicated, when she was famed for her tomboy skater look.
But now aged 26, she said she has moved on to more feminine styles.
“When I was younger, I dressed skater and had that whole thing going on,” she told the Daily Record. But as I grew up, I eventually started wearing heels and dresses. Over time, fashion choices change. Now that I'm older and have a clothing line, I'm more into fashion.'
She aded: 'I like to dress with rock 'n' roll elements and be casual. I like jeans with rips and skulls, but now I wear more flattering pieces. I would never have worn heels or tight trousers before, or dresses. Today, though, I enjoy it. I've grown up.'