Hugh Hefner's son Marston has been ordered to take domestic violence classes for a year after allegedly beating his Playboy Playmate girlfriend Claire Sinclair.
 
Marston Hefner was charged with corporal injury on a cohabitant following the incident on February 12.
 
He pleaded no contest in court on Tuesday, according to TMZ.com.
 
A vandalism count, relating to a computer he allegedly trashed during the altercation at the couple's Pasadena, California home, was dismissed.
 
The judge also ordered Marston to stay away from the model.