A convicted sex offender has been charged with molesting a 3-year-old girl while staying with the girl’s mother, who authorities say tried to cover up the crime.

Robert Shawn Burkhart, 25, of White Oak Street, was charged late Thursday by the Onslow County Sheriff’s Department with two counts of sex offender use of a social Web site, nine counts of indecent liberties with a child, two counts of exhibiting harmful performances to minors, and contributing to the delinquency of a juvenile. His bond was set at $205,000.

The 23-year-old mother, of S. Queens Street in Hubert, was charged with contributing to the delinquency of a juvenile, nine counts of exhibiting harmful performances to minors, and obstructing justice. Her bond was set at $10,000. The woman is not being identified to protect the child’s identity.

Authorities say Burkhart and the woman met on the social Web site FUBAR.com, and after dating for a month, she learned about Burkhart being a registered sex offender.

Burkhart stayed with the woman on Queens Street in Hubert numerous times and on several occasions Burkhart and the woman “performed sexual acts in the nude and in the presence and view of the 3-year old (girl).”

The 3-year-old girl told investigators that during Burkhart’s stay “he had restrained and positioned her body exposing her nude buttocks to Burkhart’s touch and indicated that he had ‘hurt her butt’ referring to her vaginal and buttocks area,” according to a press release by Onslow County Sheriff Ed Brown.

During the investigation, the woman obstructed justice by warning Burkhart investigators were on the way to seize evidence in the case, authorities said.

She could possibly face additional charges after the investigation is complete, detectives said.

Also as a registered sex offender, Burkhart knowingly violated the terms of his probation by creating and maintaining a personal Web page on FaceBook and MySpace from Oct. 2008 until June.

Burkhart has been registered as a sex offender since a 2001 rape conviction, according to the N.C. Sex Offender Registry.