2000s
In 2000, Tiffany released her fifth studio album, The Color of Silence, which received favorable reviews. Billboard described it as "one of the best pop albums of the year" and the year's "biggest surprise". Her College Promotional Tour broke attendance records at most tour stops.
Tiffany posed nude for the April 2002 issue of Playboy. Tiffany stated in interviews that she explained to her nine-year-old son that it was no different from posing in Vogue or Elle, except that it showed more. She added years later that while she had no regrets about posing in Playboy, some of her family members disapproved because of how young her son was at the time.
On April 2, 2005, Tiffany was featured on the British TV show Hit Me, Baby, One More Time, performing the Girls Aloud song "Love Machine" and securing a place in the show's finale. She also appeared on the US version of the show on June 2, 2005, losing to hip hop group Arrested Development. Tiffany released her sixth studio album Dust Off and Dance on CD Baby in May 2005, followed later as a digital release on iTunes. It was dedicated to her new husband, but recorded as a thank you to her fans (particularly her gay and European fanbase) for reminding her about the fun to be had with her career. The album consisted of Eurodance and Hi-NRG style songs. Singles from Dust Off and Dance, included "Ride It", "Fly", "Be with U Tonite", "Na Na Na", and "Artificial Girlfriend".
Tiffany toured with the album, which in September 2006 was nominated for six JPF Awards. She won for best dance song of the year for "Be with U Tonite" and best dance CD of the year on November 4, 2006. In 2007, Tiffany, who had begun to struggle with her weight, was cast for the fifth season of VH1's Celebrity Fit Club. The show premiered on April 22, 2007. During the show, the singer's weight started at 152 lb (69 kg) and finished with 124 lb (56 kg), a difference of 18.4%. In April 2007, Tiffany released a new album of cover material titled I Think We're Alone Now: '80s Hits and More on Cleopatra Records. The album features updated versions of her first three Top Ten hits from her debut album, as well as cover versions of songs from other artists of the 1980s.
Tiffany's music video for "I Think We're Alone Now" is featured in an episode of The Goldbergs, an episode of The Umbrella Academy, and the 2012 film Ted. Tiffany in 2007 signed a recording contract with 10 Spot Records, a new division of Water Music Records Group, distributed by Universal Music Group, and released a new album titled Just Me. The album contained all-new material in a singer-songwriter format à la her earlier album The Color of Silence (2000). The first single from the album, "Feels Like Love", was released on May 1, 2007.
In early August 2007, the dance single "Higher" began showing up online. On October 2, 2007 (Tiffany's 36th birthday), it debuted on the Billboard Hot Dance Club Play chart as the number-one breakout, her first Billboard chart appearance since 1989. From there, the single climbed the charts to No. 19. In March 2008, Tiffany released Mimi's Kitchen, an album limited to 500 copies and featuring rare demos from age three through the present. It was shipped to fans in a personalized package which also included autographed photos, two autographed CDs, and the Mimi's Kitchen demo collection. A small subset of the release also included Playboy T-shirts.
In late April 2008, a track with the same name as her 2005 dance album Dust Off and Dance became available for download on the Internet. The song consisted of Tiffany performing vocals for the dance team Hydra Productions; it is on their album Liquid. In early January 2009, the single reached number one on the Hot Club Play Breakout charts. In late July 2008, a new Tiffany dance song remixed by Dave Audé, "Just Another Day", was released on CD. It peaked at No. 28 on the U.S. Billboard Dance chart. On October 18, 2008, Tiffany appeared on the CMT reality show Hulk Hogan's Celebrity Championship Wrestling, and was eliminated in the first episode.