Derry McCann, 28 has already served a life sentence for an almost identical attack on a trainee solicitor.
On January 13, McCann attacked the woman, 24, in a park in Hackney, east London, as she walked home after a night out.
Incredibly, he then got married at The Vestry in Bromley-by-Bow later that day – posting pictures of himself with his new wife on his Facebook page.
The judge who sentenced McCann to life in 2006 for attacking a young lawyer had said there was a “very substantial risk” he would strike again.
McCann now faces another life sentence after he admitted three counts of rape, one of assault by penetration and one of robbery at Snaresbrook Crown Court today.
Kate Bex, prosecuting, said: “It was about midnight or just a little after and the victim was walking a short distance home having been out at an art gallery and socialising with friends.
“She was almost within sight of her front door having walked round the side of the park on her usual route home.
“Unfortunately when near the exit to the park the defendant grabbed her arm and pulled her off the path to one side and began a sustained and systematic attack.
“He asked the victim what she thought he was going to do to her before carrying out the actual attacks that he did.”
“You will be going to prison as you understand for a very very long time”
Judge Martyn Zeidman
He stole her mobile phone and “a piece of her underwear”.
Edmunds Vickers, defending, conceded: “A life sentence is inevitable.”
McCann was arrested and charged six days later.
Judge Martyn Zeidman remanded him in custody ahead of sentence on April 28.
He said: “You have done the most terrible things.
“You will be going to prison as you understand for a very very long time.”
The sex beast was 17 and on a tag for burglary when he preyed on the 30-year-old trainee lawyer as she made her way home through an east London park in May 2006.
After snatching the woman’s handbag he chillingly told an accomplice: “I’m gonna have some fun with this one.”
The monster then dragged her down to the secluded banks of a pond in Mile End Park to inflict a string of disturbing sexual assaults.
McCann, of Bow, east London, admitted three counts of rape, one of assault by penetration, and one of robbery.