Colleen Hoover is taking sides.

The author, 45, took to social media to promote Britney Spears‘ 2023 memoir, The Woman in Me, on Tuesday, October 21, the same day that the pop star’s ex-husband Kevin Federline released his own tell-all, You Thought You Knew.

“Let’s get this baby to number 1!” Hoover wrote via Facebook alongside an Amazon link to Spears’ book.

In the comments section, fans rallied behind Spears, 43 — and Hoover’s campaign.

Britney Spears Book Revelations: Biggest Bombshells From 'The Woman in Me'

“Already have the audible, purchasing a physical copy to show more support,” one Facebook user wrote.

“I read it when it first came out, just checked it out from the library. Had the hubby buy it today to support her!” another shared.

A third fan wrote to Hoover, “Love to se

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