Drew Sidora is accusing estranged husband Ralph Pittman of being a «serial cheater and adulterer» in her divorce petition.According to legal documents, obtained by ET, the star filed for divorce on March 1 in Gwinnett County, Georgia, and said the marriage is «irretrievably broken» after claiming Pittman «has committed adultery» and «committed cruel treatment towards her.»In the documents, Sidora is also asking for temporary and permanent physical custody of their two minor children. She also wants joint legal custody but final decision-making authority on all major decisions of the children awarded to her.