The model confirmed her pregnancy last month (Sep12) by showing off her bump on the red carpet at the MTV Video Music Awards alongside her hip-hop star beau.
And the rapper has revealed he has banned cigarettes from their home and only sparks up outside so that Rose doesn't have to endure the smell of smoke.
He tells Mtv.com, "I smoke outside instead of inside. Everything is all about smells, man. If the smell irritates her, then it gotta go (sic)."