The star congratulated fellow Britain's Got Talent judge Morgan after he tied the knot with The Daily Telegraph columnist Celia Walden.
Holden tweeted: "Piers got married today!! I could not be happier for my lovely friend!! Celia his wife is fabulous! Big party for us lot very soon xx (sic)"
According to recent reports, Morgan decided not to invite Holden and Simon Cowell to the ceremony.