Actor Seth Peterson is facing a divorce battle with his pregnant wife.

The Burn Notice star's partner, actress Kylee Cochran, has filed for divorce after 12 years of marriage amid allegations he cheated on her with a 22-year-old woman.

In court papers, Cochran claims she found out about the alleged affair in September (13), when she was three months pregnant with their third child.

She is now seeking full custody of their eight-year-old daughter and five-year-old son, as well as her unborn baby, according to Tmz.com.