Arnold Schwarzenegger and Maria Shriver reunited in a rare family photograph shared by their daughter, Katherine Schwarzenegger, during celebrations for the actor's 79th birthday. Schwarzenegger and Shriver separated in 2011 after he acknowledged fathering a son, Joseph Baena, during their marriage. Katherine's latest tribute included several family photographs, with the rare image of Schwarzenegger and Shriver together drawing particular attention. Despite the highly publicized split, Schwarzenegger and Shriver gradually rebuilt a cordial relationship, frequently coming together for birthdays, holidays, graduations and other family milestones involving their children and grandchildren. Schwarzenegger has publicly described Shriver as a "really good friend," while both have emphasized keeping their family united despite the painful end of their marriage.