The trio and Hudson’s 12-year-old son, Ryder, from her relationship with rocker Chris Robinson, shared a sweet family snap to mark the special day.
Hudson captioned the family selfie: 'Bday time' and added a heart emoji, while Bellamy posted the same picture, writing simply, “Happy B’day Bing!!!”
Kate and Matthew began dating in 2010 and become engaged a year later. They split in 2014 and have remained friends since.