Family insiders told Radio VOP that Rumbidzai will fly back home for the wedding which is set to take place in Harare on July 17.
The venue cannot be named for security reasons.
Tsvangirai’s relatives said wedding preparations were now at an advanced stage with invitation cards being distributed.
No comment was readily available from the Prime Minister’s family.
Tsvangirai has six children-three boys and girls-with his late wife Susan, who died in a car crash last year.
His eldest daughter is Vimbai, a town plkanner by profession, while his last daughter Millicent is still in high school.
Rumbidzai’s profession could not be ascertained by the time of publishing.