Britney Spears finally admitted to cheating on Justin Timberlake with Wade Robson in her new tell-all memoir, "The Woman in Me," however, she claims that they just "made out."

On the other hand, the "Oops I Did It Again" singer's claims were refuted by her collaborator Annet Artani, Spears' co-writer for "Everytime," her apology song dedicated to the "Mirror" singer.

According to TMZ, Artani came forward and alleged that the affair that went on between Spears and Robson was "deeper" and "way more serious" than just a kiss.

The songwriter said that she saw a 14-page breakup letter addressed to Robson, which was hidden in Spears' makeup bag.

Before Spears could even give it to Robson, Timberlake allegedly found it first, which led to their eventual breakup.

Britney Spears Confesses to Affair

Artani adamantly explained that there was no way the affair was not serious because a 14-page letter seemed overboard for a kiss.

"My understanding is that if you're writing somebody a 14-page letter, I would think that it's more than 'we kissed one time,'" she said.

 "I think it's deeper also because they were all friends. ... I think it's much more complicated than to say, 'We tap kissed at the end of the bar one night.'"

READ MORE: Britney Spears Reveals How 'Crossroads' Movie 'Messed' Her Up: 'I Was Someone Else For MONTHS!'

Britney Spears on Her Bombshell Memoir

Aside from the cheating, Spears had a lot to reveal about her relationship with Timberlake, as well as other events that took place in her life, like the infamous conservatorship.

She even took to social media to explain that "The Woman in Me" was "not to offend anyone by any means !!!"

"That was me then ... that is in the past!" She reasoned, adding that she "doesn't like" the media coverage of the excerpts from the memoir.

"I am here to establish it that way for the rest of my entire life," she continued. "Either way that is the last of it and s**t happens."

Elsewhere in her memoir, she revealed that she and the "Cry Me a River" singer had a baby together, but decided to terminate the pregnancy because he was not ready to become a father and that they were too young.

The "Toxic" singer finally ended her social media

​​ by stating that she wrote the memoir for "closure on all things for a better future."

READ ALSO: Britney Spears Had Abortion At Home! 'It Was Important NO ONE Find Out'

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