Britney Spears Claims Justin Timberlake Cheated On Her w/ Celebrity (Report)

Britney Spears is reportedly shedding more insight into her relationship with Justin Timberlake. Sources tell TMZ that the pop icon's anticipated memoir "The Woman in Me" includes an accusation that Justin cheated on her with another celebrity. Access Hollywood has reached out to reps for Britney and Justin as well as publisher Simon & Schuster. Per the outlet, the other woman is not named and Britney reportedly explains that she didn't want to embarrass her because she now has a family. The reported revelation comes shortly after Britney's explosive claim that she got an abortion during her and Justin's relationship, writing in a memoir excerpt obtained by People that the "SexyBack" singer felt that it wasn't the right time to start a family and "definitely wasn't happy" about Britney's pregnancy. Justin has yet to respond to a request for comment from Access as of Oct. 18. Infidelity speculation surrounded the now-former couple after their 2002 breakup. Though neither star specifically addressed the rumors at the time, many believed that Justin's hit "Cry Me a River" was about Britney and her own alleged cheating. She appeared to respond in her own emotional track "Everytime" in 2003, but fans are now looking at the song and its video in a new light following the pregnancy bombshell. "The Woman in Me" will be available wherever books are sold starting Oct. 24.