Think it's easy making music videos? Not according to pop sensation Britney Spears, who had a helluva tough time making the video for "Oops!... I Did It Again."

"I had a red vinyl catsuit on and it made me look completely flat, so I had to wear those fake boobs," the 18-year-old singer tells Allure. "But then they started falling down and I was so humiliated! We ended up having to sew them in.

"The catsuit was extremely hot," she adds. "It got to the point where the sweat was coming out of the sleeves when I'd swing my arms around. It was so gross! We did that dance number 15 million times."

After a full day of catsuit suffering Spears returned for a second day of shooting, only to be hit in the head by a big piece of metal holding an overhead camera. The gash required four stitches and forced producers to temporarily shut down production. Finally, many hours later, the production wrapped.

"I was like, you know what? I need a massage," she says. "So I got one. It totally cleared my mind, and I was so rejuvenated."

Spears says she's also taking better care of herself these days through a healthy diet made up of cereal, Caesar salads, soup and lots of turkey sandwiches. But she admits to the occasional slip: "The other day I had Wow! Doritos and I ate too many. I used to eat them all the time and they never upset my stomach, but at the show I was leaning over and I was crying because I hurt so bad. I was saying, 'I'll never eat Wow! Doritos again!' "