Ian Huntley was found guilty of the murders of both Jessica Chapman and Holly Wells on Wednesday 17 December after the jury considered the charges for four days. They're the most serious charges for which he could have been found guilty.
It means the jury didn't believe his story that the girls died accidentally at his home.
Maxine Carr was found not guilty of the charge of assisting an offender - which means the court believed her story that she didn't know what Huntley had done and wasn't there when the girls died.
But she was found guilty of a less serious charge of conspiring with Huntley to pervert the course of justice. That means the jury believe she lied to the police afterwards to help Huntley cover up what had happened.
Ian Huntley received two life sentences for his crimes.
Maxine Carr was sentenced to three and a half years for her crime but she'd already been in prison for 16 months waiting for the trial. That means she won't have to serve the full sentence.
There is even a chance that she could be out of prison within a month, wearing an electronic tag so police can monitor her movements.
It has not been revealed if either Carr or Huntley will appeal against either their convictions or their sentences.