The model and her rapper fiancé Wiz Khalifa did not plan the alleged pregnancy but are reportedly delighted to have a little one on the way.

According to Dailymail Online, the engaged couple may tie the knot sooner than they originally intended to, moving the date to October.

A source close to the couple said: ‘Amber and Wiz unexpectedly got pregnant, but they're really happy to be starting a family together.’

It will be the first child for both of the stars.

A baby on the way means the 28-year-old will be making some serious alterations to her lifestyle, including quitting smoking and accepting that her figure is going to change.

Wiz, whose real name Cameron Jibril Thomaz, announced the pair were set to wed in March when he posted on Twitter: ‘She Said Yes!!!’

Amber then posted a snap of her stunning oval-shaped diamond ring to her own page and said she was the ‘happiest woman in the world.’

Amber came into the limelight when she famously dated rapper Kanye West, who is now dating another 'it' girl Kim Kardashian.