Simply because famous celebrities like Leonardo Dicarpio, Vanessa Hudgens, Pamela Anderson, Kate Hudson, Sienna Miller, Kate Winslet, and many more celebrities are wearing them so proudly, even sometimes it looks odd to them.
Aside from that I think other reasons why ugg boots are so popular is because of the fact that they are pretty comfortable to wear and stylish too. These boots can go well to any kind of outfit, though they are more perfectly suitable with tight jeans tucked into them or in short skirts or short shorts. And even though these boots are made from genuine sheepskin they can be worn in all types of weather, even summer, dude! Because the sheepskin of these boots allows air to circulate, it keeps your feet cool inside even when the weather outside is too hot. So its no wonder why these boots are so popular.
