Beyonce had breast implants when she was 18 or 19 years old. She was 21 when she played Foxy in Austin Powers Goldmember and had already had a boob job at that point in time. Her bra size was a B cup before implants, but now it's a 34 C. Here we can see her with and without the implants in.
Here's Beyonce at age 21 playing the role of Foxy in Austin Powers. As we previously stated, she already had a boob job before this movie. Check out her nose job transformation too.