In her new book, Britney Spears drops another bombshell: she says she was cheating on her ex-boyfriend Justin Timberlake.

A source says that Spears writes in the book about dancing and making out with Robson, 41, in a Spanish pub when she was dating Timberlake, 42.

The Toxic singer goes on to say that she and Timberlake “agreed to move past” the affair after being “loyal to Justin” and “only having eyes for him” for years.

After they broke up in 2002, the ‘NSync star released the music video for his song “Cry Me a River” in 2003. Since then, there have been reports that Spears cheated on Timberlake.

The model in the song video who looks like Spears made it look like the “Gimme More” singer had cheated. In late that same year, Spears told Rolling Stone that Timberlake had told her that he was going to release a “controversial” video.

It was good for him. That was her claim at the time: “He got what he wanted. I think it looks like such a desperate attempt, personally. But that was a great way to sell the record. He’s smart.”

In the movie “The Woman in Me,” Spears admitted that she had cheated on Timberlake with another famous woman. She also said that Timberlake had an affair with her. TMZ says that Spears didn’t say who it was because she now has a family.