Pink's pregnant with baby number two

Grammy-winning pop star Pink is expecting her second child with husband and motocross champ Carey Hart.

Pink is expecting her second child with husband and motocross champ Carey Hart. (AAP)

The baby news was confirmed on Saturday by publicist Meghan Kehoe after Pink posted a baby-bump shot with five-year-old daughter Willow on Instagram.

The caption read simply, "Surprise!" There were no further details.