Christina Aguilera has introduced her baby daughter to the world by sharing a snap of the tot on social media.

The pop star gave birth to her second child, a little girl named Summer, in August (14) and she has now unveiled the latest addition to the family in a photograph on her Instagram.com page.

In the picture, Summer is seen wearing an outfit emblazoned with the phrase "Lil Diva" and the singer added in a caption, "Watch out... another one's getting ready to conquer the world! Driven diva 2."

Summer is Aguilera's first child with her fiance Matt Rutler. She also has a young son Max with her ex-husband Jordan Bratman.