The incident is said to have taken place following a JLS gig in Wolverhampton gig in 2016.
Williams denies the allegation.
The singer and a male friend reportedly invited two female fans back to their hotel, the four star Ramada Park Hall.
The girls claim one of them forgot some of their belongings and retuned to the hotel room.
A source told The Sun: “It’s then she says she was raped.
“Police were called to the hotel shortly afterwards to a report of rape. Williams was arrested there.”
West Midlands Police confirmed development in the case in a statement saying: “We’ve charged two men with sexual offences after an allegation of rape at a Wolverhampton hotel.”
In a statement released in December 2016 a spokesperson for West Midlands Police said: “West Midlands Police were called to a Wolverhampton hotel at 7.45am on Friday 2 December after an allegation of rape and sexual assault was made by a 20-year-old woman.
“A 30-year-old man has been arrested on suspicion of rape and a 29-year-old man arrested on suspicion of sexual assault.
“Both men have been bailed until February, pending further enquiries.”
Meanwhile, a statement released by Williams’ management company 10 Worlds Music UK shortly after the allegation was made said: “Oritse denies the allegations against him.
“The matter is in the hands of the police and it would be totally wrong for us to comment any further.”
Williams shot to fame in 2008 on series five of ITV show The X Factor.
The group, which was made up of Aston Merrygold, Marvin Humes and JB Gill, reached the live final though lost out of the top spot to Alexandra Burke.