Los Angeles, California - Britney Spears has made another scathing claim about Justin Timberlake in her new book, The Woman in Me!

The 41-year-old pop star's anticipated memoir has the world gagging from the few shocking details already revealed.

Now, another explosive claim from Britney's book alleges more drama went down between her and the 42-year-old *NSYNC member.

According to Page Six, the Hit Me Baby One More Time singer has claimed that her ex cheated on her with another celebrity!

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Reportedly, Britney, who dated Justin from 1999 to 2002, doesn't reveal who this famous lady is since the person in question "now has a family" that the singer "doesn't want to embarrass."

This isn't the only tea shared by the Gimme More artist in the tell-all, as previous reports revealed that Britney detailed an abortion she had after becoming pregnant with Justin's child.

Though the Cry Me a River singer hasn't outright addressed his ex's claims, per Entertainment Tonight, Justin, who is now married to Jessica Biel, is said to be "focusing on his own family and trying not to concern himself with Britney's memoir."