The 'Complicated' singer - who has been married to the Sum 41 rocker since July 2006 - had their divorce signed off by a judge on Tuesday (16.11.10) after Avril filed for a legal separation in October 2009.
According to court documents obtained by gossip website TMZ, the pair signed a prenuptial agreement prior to their marriage, which saw their assets divided in half.
Avril kept the couple's Beverly Hills mansion, her musical instruments, lyrics and songs, their Volvo car and all other pieces of jewellery, artwork, awards and items of clothing.
Meanwhile, Deryck was entitled to his guitar collection, song catalogues, artwork, jewellery, awards and mementos.
The prenup stipulated that neither party would be granted spousal support.
She recently said: "They're very happy together, they're really good together. A lovely couple."