How can I stop my eleven year old daughter from becoming a slut?

Yes, the term is harsh from a mother's mouth, but that it was she is turning herself into. I keep an eye on her texts and Facebook account to make sure she is safe, and I find pictures with cleavage, revealing clothes, and facial expressions found on Megan Fox and other celebrities of that nature. She seems to attract more boys than she should; I am thrilled that she is successful with boys, but I don't want her to get so wrapped up in it, that she loses focus on her goals. I am also worried that once she reached adolescence, she may become out of hand and dig herself into a deep legal hole. What precautions can I take, and how can I handle her without creating a hate-bond between us?