An illegal alien pleaded guilty to recruiting a pregnant 15-year-old girl into become a prostitute for a sex-trafficking ring that operated around the D.C. region.

Yanira del Carmen Guerrero Andrade, 28, pleaded in federal court in Alexandria to child sex trafficking, which carries a mandatory minimum of 10 years and a maximum of life in prison. Sentencing is set for May 10.

"Ms. Guerrero Andrade's actions show just how vile the world of human trafficking is -- right here in our community," said U.S. Attorney Neil MacBride. "Many people think human trafficking is a man's business -- but the recruiters are often women, and we hold them accountable.

Prosecutors said the ring was run by members of the MS-13 street gang, mainly in Prince George's County and Northern Virginia.

According to court documents, Guerrero Andrade, first met the teenager at a nightclub in Hyattsville in January 2009, after the girl had run away from home.

Guerrero Andrade, a native of El Salvador who was illegally living in Adelphi, helped the pregnant victim find a place to stay and then recruited her to work as a prostitute answering to Guerrero Andrade's boyfriend, Julio Cesar Revolorio Ramos, prosecutors said.

On the first day as a prostitute, the girl had sex with about 17 men, and on the third day she had sex with 25 customers.

After having sex with more than a dozen men, she was crying and asked Guerrero Andrade and Revolorio Ramos if she could stop because she was sore. The couple pressed her to continue.

Guerrero Andrade and her boyfriend kept a portion of the proceeds that the victim earned. Customers were charged $30 for 15 minutes. The boyfriend also charged the girl for rent.

Guerrero Andrade also allegedly introduced the victim to other men besides her boyfriend so the victim could work as a prostitute for them.

Several customers allegedly requested the victim specifically because she looked young.

Revolorio Ramos was sentenced last week to more than 15 years in prison for his role in the crime.