Christina Aguilera wore sweat pants onstage when she was pregnant.
The 27-year-old singer is famed for her outlandish and provocative clothes, but admits comfort was her priority when she was expecting son Max Liron - who she delivered in January.
She said: "The last time I was on tour I was a few months pregnant, and towards the end we were changing some of the costumes into sweat pants.

From : http://www.femalefirst.co.uk