Here's an article from the time.
Boobpedia has this to say: "McKenzie's large chest had caused her physical discomfort since she was a teenager. A newspaper profile written when she was 16, and already wearing a size 34GG bra, noted that she often got backache as a result of her breast size.[4] Her breasts continued to increase in size until she was wearing a 36HH bra. In December 2005, seven months after having her baby, she underwent breast reduction surgery to decrease their size to 36E.[6] In July 2010, McKenzie again underwent surgery on her breasts, this time receiving implants to enhance their size.[7]"