Michelle Ryan, who plays the troubled teenager in the popular TV soap is suffering with extreme nervous exhaustion.
The wedding was due to be filmed in the next couple of weeks but now the scripts are having to be re-written.
Two month delay
The storyline has been coming to a head recently as the two lovers tried to hide their relationship from Zoe's mum Kat Slater.
Kat used to go out with the doctor and is still in love with him.
Michelle is now recovering at home and possibly won't be available to film the wedding scenes for at least two months.