The fashion designer, who gave birth to second son Klay in May, looked beautiful in her cream dress as she wrapped an arm around Wayne and beamed for the camera.
Coleen sent a message of congratulations to her newlywed friends, saying: "Fantastic weekend with Wayne Rooney… Wishing you all the love and happiness in the world."
The wedding was that of Everton footballer Darron Gibson, who previously played at Manchester United with Wayne, and his girlfriend Danielle.
We imagine the loved-up affair brought back happy memories for both Coleen and Wayne, who celebrated their fifth wedding anniversary with a trip to see Rihanna in concert earlier this month.
The childhood sweethearts married on the Italian Riviera back in 2008. They've since become parents to sons Kai, 3, and little Klay, who was born on 21 May.