That is not plaster casts. She's had something done that required her to hide her lower legs and has concocted the heels damage to cover herself.
If you need proof then bear in mind the incredibly photo manic woman who even has her pet photographer with her has posted no images of her hospital dash. No ambulance (which there'd have to be with potential broken legs,) and no images of doctors or nurses applying the 'casts'.
The only thing in that area might be her tattoo of the date she met Leo Penna, which coincidentally is the birth date of Peter Andre. I know, you couldn't make it up.
It would be just like her to have it removed in one session that necessitated a bandage, so she grabbed the opportunity to fake a decent injury. It will come out, it usually does especiall when loose lipped kids are involved in things.