Fergie has achieved chart success as the female vocalist of the hip-hop group, The Black Eyed Peas, as well as a solo artist.

The 42-year-old singer, who recently released her first studio album in 11 years, is also considered as one of the most popular solo female artists in the world today. However, her journey to stardom includes a battle with drug addiction that not many people know about.

Fergie Talks Crystal Meth Addiction

In a recent interview with British publication iNews, the Double Duchess hitmaker, Fergie candidly opened up about her past struggle with crystal meth addiction and the serious implications it had on her health.

The "Fergalicious" singer said that before she found fame with Black Eyed Peas, she was severely addicted to crystal meth. Her addiction was so bad that she started having hallucinations every day.

"At my lowest point, I was [suffering from] chemically induced psychosis and dementia," she revealed. "I was hallucinating on a daily basis. It took a year after getting off that drug for the chemicals in my brain to settle so that I stopped seeing things. I'd just be sitting there, seeing a random bee or bunny."

'The Hardest Boyfriend'

Fergie pointed out that the intensity of her visions reached a point where she actually thought that the CIA, FBI, and the SWAT were following her. She then recalled one encounter when she tried to find comfort in a church but was chased away because of her crazy antics inside the place of worship.

She further said that although the drug phase was "a lot of fun," it was the lowest point in her life. However, she is grateful that it happened because she used it as a learning experience.

This isn't the first time Fergie has spoken about her history of drug use in the hopes that her story can help others. In 2006, she referred to her addiction as "the hardest boyfriend" she had to part ways with.

Split With Josh Duhamel

In September, Fergie and husband Josh Duhamel announced via a joint statement that they were splitting up after eight years of marriage. The former Hollywood couple shares a 4-year-old son named Axl Jack.

In her interview, she also touched on life as a single mother, how she's managing work and dealing with her separation from the Transformers actor at the same time.