Britney Spears has had four books published including A Mother's Gift. She has also had seven DVDs including her 2005 reality series Britney and Kevin: Chaotic, a doll, a video game, and participated in seven tours including The Onyx Hotel Tour in 2004. She has grossed over US$150 million from tour ticket sales and over $45 million in merchandise from her tours.

Spears endorsed a fragrance, "Curious", for which she earned a reported US$12 million. After one year of sales, the product netted more than US$100 million. Curious was named the best selling perfume of 2004.[1] Following the success of "Curious", Spears released her next Elizabeth Arden fragrance, "Fantasy", in September 2005. In April 2006, Spears launched Curious: In Control as a limited edition fragrance. Early 2007 saw the release of yet another perfume: Midnight Fantasy.