However, actress Jennifer Metcalfe, who plays the fiery temptress, has teased that anything could happen in the run up to the nuptials - especially as Mercedes is continuing an affair with Riley's father Carl.
Holy Soap reports that the former Dancing On Ice contestant said: "It's definitely in the pipeline - a third wedding at her age, it's ridiculous! But at the same time it works for the character, so it could be..."
Commenting of her affair with father-in-law-to-be Carl, Metcalfe said that Mercedes does not have any intention of ending the relationship.
"She's managing so far - I don't know where she gets the energy from! But I honestly don't know how long it will go on for," the actress added.