Who's on the cover of "Twisted: A Pretty Little Liars Novel?"?

I saw the picture, it was released a few days ago.a href="http://www.google.ca/imgres?imgurl=http://lifeaftertwilight.net/wp-content/uploads/2011/04/Twisted.jpg&imgrefurl=http://lifeaftertwilight.net/latblog/&usg=__0XUOzaL_Ihcnj_y_2mOfuEGEeaE=&h=2550&w=1687&sz=793&hl=en&start=49&sig2=XaqmcjTGbn2acezTkSINoA&zoom=1&tbnid=6GwzEYU5CyJUZM:&tbnh=148&tbnw=98&ei=bZe9TYGjGJGssAPj9I3YBQ&prev=/search%3Fq%3Dtwisted%2Ba%2Bpretty%2Blittle%2Bliars%2Bnovel%26um%3D1%26hl%3Den%26client%3Dsafari%26sa%3DN%26rls%3Den%26biw%3D1024%26bih%3D605%26tbm%3Disch0%2C1272&um=1&itbs=1&iact=hc&vpx=129&vpy=224&dur=5875&hovh=276&hovw=183&tx=116&ty=169&page=4&ndsp=15&ved=1t:429,r:0,s:49&biw=1024&bih=605" rel="nofollow"http://www.google.ca/imgres?imgurl=http:…/a Is it Spencer or Alison?