Kills rocker groom Jamie Hince asked his bandmate Alison Mosshart to do the honours.
But it backfired when Alison, 32, lost the crowd by rambling on too long.??
She recalled embarrassing stories about 42-year-old Hince and advised supermodel Kate, 37, on how to treat her man.
A source at the wedding told British newspaper The Sun: 'It was tumbleweed stuff. Alison got it all wrong.
'It was a rambling, boring and patronising speech. Kate had her head in her hands by the end and people were telling Kate's brother to pull the plug on the microphone.'
Meanwhile Moss fed guests chips and bacon butties to keep them partying all night as she celebrated her £1million wedding with a three-day bash.