Despite receiving anything but positive reviews, Heidi Montag's debut single "Higher" reached No. 7 on the iTunes Top 10 pop chart. "Looks like all the haters are also buying it!" The Hills star tells Us Weekly in its latest issue, on newsstands now. But the negative responses – "Makes me feel uncontrollably ill," "beyond pathetic," and "the crappiest video I have ever seen" were just some ...