Amber Rose and Wiz Khalifa are expecting their first child

Amber Rose is pregnant with her first child, it has been reported.

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

It has also emerged that the engaged couple may tie the knot sooner than they originally intended to.

A source told Radar Online: “Amber and Wiz unexpectedly got pregnant, but they’re really happy to be starting a family together.”

And 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.

Amber Rose and her rapper fiancé Wiz Khalifa did not plan the alleged pregnancy

The insider claimed: “Amber’s already had to make some big lifestyle changes, like not smoking cigarettes anymore.

“As a model she’s used to having a thin waist, so this is going to be an adjustment for her.”

The happy couple was planning on marrying in the winter but MediaTakeout reports that they are now hoping to bump the big day up to October.

The website claims that Amber Rose is expected to give birth to the baby in January and doesn’t want to have the wedding too close to her due date.

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

Wiz Khalifa, whose real name Cameron Jibril Thomaz, announced the pair was set to wed in March when he posted on Twitter: “She Said Yes!!!”

Amber Rose 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”.