Singer to make live comeback at Colin Montgomerie's nuptials
Four hundred guests, including Prince Andrew and Hugh Grant, will be at the special show, which will be held on the banks of Loch Lomond on April 19.
DJ Chris Evans will compere the gig.
Montgomerie told the newspaper: “I’m not allowed to say anything. This will be an extraordinary event.”
Monty and Robbie have been friends since meeting at a celebrity golf tournament in 2005.