The woman reportedly went forward to the police naming the St. Louis native, whose legal name is Cornell Iral Haynes Jr., specifically as the aggressor.
Nelly was due to perform on the Smooth Stadium Tour in Ridgefield near Portland on Saturday evening. The Hornets' media guide for the 2015-16 season listed Les King, an executive of Nelly, Inc., as the rapper's representative in the ownership group.
Here's a concertgoers' video of Nelly's performance, just hours before the rape claim.
"Nelly is the victim of accusations totally invented", assured the AFP his lawyer, Scott Rosenblum.
Nelly rose to fame with a solo career that began in 2000, with the release of his debut album "Country Grammar".
"Our initial investigation, clearly establishes, this allegation is devoid of credibility and is motivated by greed and vindictiveness", Rosenbaum said in statement to The Blast on Saturday.
According to TMZ, the woman reported the alleged rape around 3:45am on Saturday morning.
He was charged with second degree rape at 7AM and taken into custody.
Nelly is on tour with country music duo Florida Georgia Line.
Nelly has not made any comment on the allegation other than through his lawyer.
Nelly is known for his hits "Hot in Herre", "My Place" and "Over and Over". He appeared in the 2005 film "The Longest Yard".