The ex-husband of pop music superstar Britney Spears is accusing the “Baby One More Time” singer of infidelity in his soon-to-be-released memoir. While promoting his book “You Thought You Knew,” Kevin Federline has unleashed a pair of accusations involving Spears’ alleged unfaithfulness.

In an interview with “Entertainment Tonight” the former backup dancer turned rapper said that the night before he married Spears in 2004, he caught her on the phone with her ex-boyfriend, pop star Justin Timberlake.

“We’re at Fairmont in Santa Monica in one of the bungalows and I was like ‘what’s wrong?,’ I thought she was talking to her mom on the phone or something. Or maybe she was having doubts.” Federline said. “And she told me she was on the phone with Justin.”

Federline went on to say he was con

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