Anastacia gained weight while she was on tour.
The 47-year-old singer - who has battled with the chronic inflammatory condition Crohn's Disease since she was 13 years old - has admitted, despite all the dancing she was doing during shows, she piled on the pounds during her 80-day tour at the end of 2014 and beginning of this year.
Speaking exclusively to BANG Showbiz, she said: "I actually gained weight on the road, which is a positive thing with a Crohn's patient. I became a healthy size rather than a size two and zero. "
Although she thinks many people would love to have her slender frame, she says she wouldn't wish Crohn's, which causes diarrhoea and unexplained weightloss - on her worst enemy because she's always dashing off to the bathroom.
She explained: "I look like I'm in good shape because I don't really have the opportunity to gain weight, which is not something you wish on someone, trust me, because I've got to know where all bathrooms are at all times."