Sean Penn was served with divorce papers by his wife ROBIN after the actress allegedly found him in bed with two other women. American magazine Star has revealed details of the couple's last weekend together and claimed the Mystic River star was caught being unfaithful to his partner of 11 years. The actors were reportedly staying at the Squaw Valley resort in Lake Tahoe, California, days before Christmas when the incident is said to have occurred, according to A source tells the publication, "Sean didn't spend much time with his wife - he booked her a separate suite - and when Robin got fed up with being alone, she went over to his suite. (There, she) found him drunk with two Russian girls." Penn married Wright in 1996 and they have two children together, Dylan Frances, 16, and Hopper Jack, 14. Wright filed divorce papers in California on 21 December (07), citing irreconcilable differences as a reason for the split. The couple are said to be seeking joint custody of their teenage kids. It is the second divorce for Penn - he ended his marriage to pop star Madonna in 1989 after four years.