Katherine announced that she was expecting her first child with her husband, Andrew Levitas, in April, and it seems she is staying as fit and healthy as possible for the impending arrival.
The 34-year-old took to her Instagram account to share a snap of her running on the treadmill, although her bump is barely visible.
The singer, who married her partner last September, has been back and forth between the US and the UK but she seems to still be able to find the time to fit in a little bit of running.
Katherine, who revealed she is expecting a little girl, captioned the stunning black and white photo: “After a busy but brilliant weekend, it's back to #Pregnancy #Health #Fitness @VirginActiveUK #BumpOnTour."
We love her Bump on Tour hastag!
The first-time-mum ran the London Marathon in 2011 and it seems the running bug has stuck with her since then.
The star was also spotted at the Glamour Women of the Year Awards on Tuesday night, but there was no sign of a bump under her beautiful electric blue, black and white Alexander McQueen dress.
