The model and Doctor Who star have reportedly called time on their 18-month-long relationship.
A source told The Sun that it was work commitments and Matt's reluctance to settle down that led to the split:
"Whenever engagement and marriage was mentioned he was uncomfortable. He's still a young man and the thought of being tied down was a lot to digest.
"This has come as a surprise to everyone. It was thought they'd be together for a really long time because they were so into each other."
The pair reportedly got together in April 2010, before splitting in May. They then rekindled their romance in July of the same year.
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
Britain to experience up to 120 days of snow in coldest conditions in years.
x Share us on Facebook