Avril Lavigne and Mod Sun have called it quits. Less than a year after getting engaged, the pop-punk musicians have decided to end their relationship, sources close to the couple tell PEOPLE.

Avril Lavigne and Mod Sun's "Flames" continue to burn strong as they celebrate their forthcoming nuptials. On Tuesday, the pop-punk princess, 37, and her 35-year-old fellow musician fiancée threw ...