The 33-year-old singer shared a picture of former One Direction star Payne on Instagram and wrote, "You are the most amazing daddy and the best example for our son. The way he looks at you says it all. Your relationship melts my heart. You are the centre of his world and We adore you."
The couple welcomed their first child together in March, a son named Bear.
Payne recently returned home after a promotional tour of his debut single "Strip That Down".
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