A woman has claimed that the Another Level singer and another male attacked her in a hotel room in the early hours of Saturday morning, reports The Sun.
Bowers had performed a DJ set at the Deco Lounge nightclub in Hertford hours earlier. The victim is said to have attended the club before heading back to the hotel and later contacting police.
The former Celebrity Big Brother runner-up was arrested after speaking to police by prior appointment on Tuesday (April 3).
Bowers has been accused of conspiracy to rape, while his 35-year-old friend is being investigated on suspicion of rape.
Both men are said to have denied the allegations and have been bailed until Monday, May 14.
Hertfordshire Police said in a statement yesterday (April 4): "A 32-year-old man from Surrey presented himself at Hatfield police station by prior arrangement on April 3.
"The man has been arrested and is assisting police following an allegation of sexual assault."
Bowers is separated from wife Chrissy Johnston, and has a son Kai, 14, with ex-girlfriend Emma-Jane North.
The singer made a brief musical comeback with the single 'All She Needs' in July 2010.