Osbourne and Mosshart got engaged in 2013.
According to usmagazine.com, a spokesperson for the 29-year-old star said in a statement: "Kelly Osbourne and Matthew Mosshart have decided to end their engagement. The split is amicable and the pair continue to have nothing but the utmost respect for one another."
"Kelly is looking forward to a New Year full of fresh beginnings. No further comments will be provided by all parties and we request privacy, decorum and space from the press but don't expect it," the statement read.
Osbourne hinted via Twitter Wednesday that things are not well in her life.
"It's all about perception sometimes the bad things that happen in life aren't really bad at all especially when you learn something from it (sic)," read her tweet.
--IANS (Posted on 09-01-2014)