Montag, 21, claims that, before surgery, she was very self conscious about her small chest. She tells Us, "I've always been very insecure about my body. My whole life, I looked at my chest and was like, OK, they're going to grow. This is my year! And it never happened. I was less than an A-cup. I wore pushup bras, which cut into my skin. If I was with a guy and there was a girl next to me with big boobs, I would be like, Oh, my God, he's looking at her! On the beach, if I was standing next to a girl with big boobs, I'd be like, I hate her!"

The aspiring singer explained that her nose was also a concern: "I hated my nose too. I have my dad's nose, which is huge. It took up so much of my face, when I looked down, I could see my nose. I couldn't get away from it!"

Heidi realizes that plastic surgery is not something that should be taken lightly. She says, "Surgery is a very big deal. Right before I went in, I was like, What if I don't wake up? Oh, this is scary. Then I thought, I don't care. If I don't wake up, it's worth it. I just wanted it so badly."

When asked if Spencer Pratt, her fiancé, influenced her decision to go under the knife, Heidi told Us, "He had nothing to do with it. If anything, he said, 'maybe you should think about it a lot longer'." She said that on the day of surgery, "Spencer said, 'I'm so proud of you.' It was like he was wishing me well off to school."