Iggy Azalea says she caught her fiance Nick Young cheating on home video

Singer Iggy Azalea says she left her fiancé Nick Young after catching him cheating on home security camera footage. Photo/AP

Iggy Azalea has revealed she didn't leave fiance Nick Young because he got his ex pregnant. She found out about that in the press.

The 26-year-old Aussie rapper took to Twitter after reports surfaced that Keonna Green, the mother of Young's four-year-old son, Nick Jr, is four months pregnant with his second child.

Iggy Azalea with her ex Nick Young at the Billboard Music Awards. Azalea says she caught Young cheating on home video footage. Photo/AP

"I have never even been told by nick that his baby mother is pregnant," Azalea wrote. "I broke up with Nick because I found out he had brought other women into our home while I was away and caught them on the security footage."

"This is just like a second shot to the chest. And I feel like I don't even know who the hell it is I've been loving all this time," she wrote. "People in this world are really f***** up."

The split came a month after a leaked video showed Young admitting to his Los Angeles Lakers teammate D'Angelo Russell that he had cheated on Azalea.

While the pair stayed together, Azalea said she was unable to rebuild her trust in Young.

"Unfortunately although I love Nick and have tried and tried to rebuild my trust in him - It's become apparent in the last few weeks I am unable to," she wrote at the time.

"I genuinely wish Nick the best. It's never easy to part ways with the person you planned you're entire future with, but futures can be rewritten and as of today mine is a blank page."

Azalea is set to team up with Adam Lambert and Guy Sebastian for The X Factor in Australia.