Mrs Danczuk, 31, wife of anti-child sex abuse MP Simon Danczuk, claims she was raped and sexually assaulted "hundreds of times" as a child at her family home in Manchester.
Simon Danczuk is the Labour MP for Rochdale where one of the first Muslim/young white teenage girl trafficking scandals broke. He is one of the pushers for the child sex abuse inquiry in the UK.
Her alleged attacker, who lives a few miles from Mrs Danczuk, was arrested by Greater Manchester Police this afternoon and is currently in police custody for questioning.
Mrs Danczuk, who became well known for her Twitter selfies featuring her cleavage, claims the abuse took place between 1989 and 1995 when she was aged between six and 12.
DI Caroline Ward of Greater Manchester Police said: "We work hard to support victims of sexual offences and thoroughly investigate all reports of sexual abuse and rape no matter how long ago they happened.
"We will do everything we can to support victims and bring offenders to justice."