Former Hills star Jenner and singer Lavigne have called time on their relationship after almost two years together, it was announced in January.
Entertainment magazine Life & Style reports that a source confirmed the break-up, saying it was down to opposing views on marriage.
Avril, 27, was previously married to Sum 41 singer Deryck Whibley and reportedly wanted to go down the aisle again - this time with 28-year-old Brody.
Could Jenner have been put off marriage by his step-sister Kim Kardashian's recent failed union?
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
Confused Apple customers are finding coins in their MacBooks.
High levels of iron help prevent hearing loss, a study has claimed.
A software engineer has constructed a fingernail-sized engine made of paper and it totally works!
Conspiracy theorists claim that there is a mysterious alien based pyramid in the Antarctic.
Toblerone design shape change angers some loyal chocolate lovers in the UK.0 comments
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