Is Demi's Twitter account cause for concern? What up with the @mrskutcher?

This one will be short because my computer is doing very infuriating things. It just ate phocking 4 pages of my thesis. Now it types backwards when I blog. It may not  last the day. It could go through the window…
But what is up with Demi using @mrskutcher on Twitter? Better yet, why is everyone making it an issue? She doesn’t have to legally change her name, you know. She can remain Mrs. Kutcher for the duration…can’t cope with this computer, sport.