The mum-to-be sparked rumours she had secretly married the Black and Yellow hitmaker over the festive season after referring to him as her "husband" during a run-in with a Tmz.com videographer in Los Angeles on Tuesday (15Jan13).
After the cameraman gifted Rose with a Teenage Mutant Ninja Turtles ice cream bar, she said, "My husband loves Ninja Turtles! That's really cute, thank you."
The comment sent fans into a frenzy, but Khalifa has now cleared up the claims.
He tells Tmz, "We've always called each other husband and wife since day one. We've always been husband and wife."
The hip-hop star previously revealed he and Rose were planning to have two ceremonies - a low-key one to make their romance official and a bigger bash for family and friends in 2013, after Rose gives birth - so she can wear her dream wedding dress.
In December (12), he told New York DJ Angie Martinez, "We're gonna get, like, licenced marriage, in a couple of weeks we'll have that done.
"When you have the (big) ceremony that's when you can invite the family. She can fit into a dress and then... if we have a daughter one day, she might wanna give the dress to our daughter, but if she's pregnant then she can't do that."
Rose is due to give birth to the couple's first child on 24 February (13).