Kevin Federline is hurling more accusations at Britney Spears.

In USA Today’s excerpt of his upcoming memoir, “You Thought You Knew,” Federline, 47, claimed that Spears, 43, cheated on him with a female backup dancer when they were dating.

The incident allegedly happened in Amsterdam in 2004 when the former couple was joined for a night out by Spears’ Onyx Hotel Tour crew, including Teresa Espinosa, who had introduced Spears to Federline one month earlier. 12

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After Federline and Spears returned to their hotel room, the “Toxic” singer left and told Federline she would be right back. Federline, who initially assumed “she was catching up with someone or handling something tour-related,” eventually went to check on Spears.

“I stepped into the hallway, our door still cracked, l

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