Avril and DeryckDeryck Whibley and Avril LavigneThe celeb couple for rock fraternity, Avril Lavigne and Deryck Whibley, have decided to live together in holy matrimony.

The punk princess and Sum 41 frontman, 20 and 25 respectively, are engaged after dating for more than a year.

Deryck popped the question to fellow rocker Avril in Venice, as she was wrapping up her European tour.

The pair are engaged after a false start - when Deryck pretended to propose last year to show how easily the press could be misled.

But this time it's a little more confirmed - publicists for both musicians confirmed it to US weekly.

We've yet to hear whether Avril will ease up on the eyeliner for the wedding.

The pair have plenty in common apart from their native Ontario, Canada and the LA house they share.

Their punk rock tunes have earned them equal success - Lavigne tallied up five Grammy nominations for her debut album Let Go, and Sum 41 have bagged themselves a top 10 album in the US with their latest release.