The big day is sure to be a nerve-wracking one for Mercedes (Jennifer Metcalfe) as so many guests know the secret of her affair with Riley's (Rob Norbury) dad Carl - and the truth will be revealed if scheming couple Mitzeee and Warren have anything to do with it…
Serial killer Silas (Jeff Rawle) will also be present for the ceremony and plays his own sinister role in the advert. Could he be planning his next murderous move?
Hollyoaks' wedding week begins on Monday, October 17 at 6.30pm on Channel 4.
> Hollyoaks' Rachel Shenton teases Mitzeee, Costello revenge plot
> Read more Hollyoaks news and spoilers
Watch Hollyoaks' new wedding trailer below: