Rainey, 44, pleaded no contest to stalking an unidentified woman earlier this year and reported to Wasco State Prison on Nov. 8.
TMZ.com said details of the incident were not revealed in the documents; however, it surmised there was a violation of a court order since prison time was handed out.
Rainey was sentenced to two years in custody. TMZ said he received credit for 401 days already served, which means he will be out in a little under a year.
Celebrity Families of 2014 [PHOTOS]