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In November 2003, Spears released her fourth studio album, In the Zone, jettisoning the Max Martin-produced synthpop of her earlier releases. The album took in lesser-known producers such as RedZone and big names including Moby and R. Kelly. Spears co-wrote eight of the album's thirteen songs and co-produced several pieces of her material for the first time. In the Zone reached number one in the U.S. charts during its debut week, selling over 609,000 copies. This made Spears the first female in the Nielsen SoundScan era to have her first four studio albums to debut at number one.^[73] The album had a mild reception from critics. Stylus Magazine gave the album a D and even blamed Spears's career choices by stating, "Ultimately, In the Zone suffers greatly from Britney's uneasy transition from teen tart to sexually powerful woman. Had Britney been in charge of her career direction instead of mercilessly prostituted by her management, she might have been able to produce something with some semblance of musical vision."^{videos porno de briney spear class="reference">[74]} The Guardian praised the album's melodies and her effort, giving it 4 out of 5 stars and writing, "Unlike previous Britney albums, In the Zone has no filler and no shoddy cover versions, just 57 varieties of blue-chip hit-factory pop. There is southern hip-hop, deep house, Neptunes-style R&B, the ubiquitous Diwali beat and, most importantly, oodles of Madonna."^[75]

In November 2005, Spears released her first remix album, B In The Mix: The Remixes. The album ranged from "...Baby One More Time" to "Toxic". Her newest single "Someday (I Will Understand)" was also remixed. Another single, "And Then We Kiss", was only released in Asia, where it charted in many countries. The song peaked britney spears sex photos.com at number 15 on Billboard's Hot Dance Airplay chart,^[88] despite it not being officially released in the U.S.^[89]

In September 2007, the official findings in Spears's custody battle were announced by the court. She was ordered to undergo random drug and alcohol testings and to attend parenting counseling. Spears and Federline continued to share joint custody of their two children on a conditional basis.^[113] A few days later, she was officially charged with misdemeanor hit-and-run and driving without a license. If convicted, she could face a year in jail.^[114] Spears lost physical custody of her children to Federline on October 1,^[115][116] with the court ruling that Federline will keep full custody of the BRITTNEY SPEARS NUDE PHOTOS children.^[117] The charges for her alleged hit-and-run that occurred in August 2007 were officially laid,^[118] she was booked for the charges by the Los Angeles Police Department on October 15 but was not arrested.^[119]