Even with 4 kids Heidi manages to look good and make everything work. Here is her secret from an interview she did for Stylelist
"Be organized. Narrow it all done to make it work," she advises. "Get rid of all the things that are too 'Mumsy.' I got rid of all my over-baggy, nasty, jim-jam things that are frumpy, so when you put things together, everything is working."