Spears took her ex-husband to task again over his new memoir, this time accusing the dancer of profiting off her "pain."

Pop superstar Britney Spears responded to her ex-husband’s bombshell claims about her, calling them “extremely hurtful and exhausting.” Dancer Kevin Federline, 47, married Spears, 43, in 2004, and they remained together until a highly contentious split in 2007.

"I am the only one who genuinely gets hurt here," Spears wrote in a statement on Kevin Federline's allegations.

Britney Spears says her ex-husband Kevin Federline is 'profiting off her' in his new memoir, in which he claims the singer would watch their sons sleep with 'a knife in her hand.'

Bolt holds the record for the fastest time over 100 metres, clocking in at 9.58 seconds at the 2009 World Athletics Championships. However, five years ago, Spears claimed that she had beaten Bolt, an eight-time Olympic gold medalist, and ran the distance in 5.97 seconds.