Blac Chyna has threatened legal action if a sex tape of her and ex-fiancé Tyga is released.

Model Blac Chyna, 27 and rapper Tyga, 26 - who started dating in 2011 after meeting at an after party for Chris Brown's 'F.A.M.E Tour' and got engaged in December 2012 - split in August 2014.

Tyga went on to date Kylie Jenner, 18, the half-sister of Chyna's former best friend Kim Kardashian West, while Chyna recently got engaged to Kim's brother Rob Kardashian following a whirlwind romance. While Tyga and Blac have had an acrimonious relationship since their split, the rapper congratulated his ex on her engagement and insisted he only wants her and their son to be happy.

Tyga, 26, tweeted: "Everybody deserves 2 be happy. What some1 does for their happiness is not my concern, as long as it's not interfering wit my happiness.

"It makes me happy to see the mother of my son happy.My only concern in this situation is my son. I want him in happy environments (sic)."

Meanwhile, Blac - who celebrated her engagement with Rob, 29, at a strip club - is excited to become a Kardashian.

Her representative revealed that the model, whose real name Angela White, is planning to use her given name once she ties the knot, saying: "She was more than excited, she was thrilled, just super happy. She's soon to be Angela Kardashian. She's ecstatic."