Disgraced actor Danny Masterson has officially begun his 30-year prison sentence, months after he was convicted on multiple rape charges. KABC-TV reported that Masterson was checked in at North Kern State Prison in Delano, California, on Wednesday, according to state officials. The 47-year-old, who was convicted on two counts of forcible rape in May, will now go through the inmate reception process that will determine in what level of security he will be housed. A mug shot of Masterson, who is best known for his role on “That 70s Show,” was released on Wednesday. The image showed him an orange…