Patrick Schwarzenegger joins brother Christopher and mother Maria Shriver at the birthday party for Chris Pratt's son Jack in Los Angeles

Chris Pratt's son Jack celebrated his seventh birthday with a party at Pratt's Los Angeles home he shares with new wife Katherine Schwarzenegger.  

Former California governor and A-list actor Arnold Schwarzenegger was among the new family members who attended, although he kept a low-profile during the festive event.

The Terminator's ex-wife Maria Shriver, daughter Christina and sons Patrick and Christopher Schwarzenegger were spotted leaving in the afternoon.

Patrick Schwarzenegger (right), 25, was spotted leaving the birthday party for Chris Pratt's son Jack in Los Angeles on Sunday

Patrick Schwarzenegger (right), 25, was spotted leaving the birthday party for Chris Pratt's son Jack in Los Angeles on Sunday

Patrick, 25, kept things casual-cool in the fashion department in black cargo pants and a black Mason Ramsey t-shirt, which is a tribute to the 12-year-old internet singing sensation.

The model-actor also donned a pair of white sneakers and a black baseball cap.

Shriver, 63, dressed in faded blue denim jeans, black tank top and black and white slip-on sneakers.

The journalist, who's the niece of President John F. Kennedy, covered up with a summery-looking dark blue and white patterned top that flowed down past her knees.

With the Southern California sun glaring down, she wore dark sunglasses and had her light brown tresses styled long, with added volume and a part to the slight left. 

Stylin': Patrick's mother Maria Shriver, 63, dressed casually for the little boy's bash

Stylin': Patrick's mother Maria Shriver, 63, dressed casually for the little boy's bash

Family affair: Christopher Schwarzenegger, 21, trailed a few steps behind his mother when they left the party at his sister's home she shares with Pratt

Family affair: Christopher Schwarzenegger, 21, trailed a few steps behind his mother when they left the party at his sister's home she shares with Pratt

Christopher, 21, trailed behind his mother by a few steps in black shorts, a white t-shirt and white sneakers.

He pulled his brown tresses back into a short ponytail. 

Pratt shares his son Jack with ex-wife Anna Faris, to whom he was married from 2009 to 2018.

He and and Katherine were married this past June at the San Ysidro Ranch in Montecito, one year after being introduced by Shriver at a church service.

Newlyweds: Pratt and Schwarzenegger were married in June

Newlyweds: Pratt and Schwarzenegger were married in June

 

 

    

       

 

 

 

 

 

 

Patrick Schwarzenegger attends birthday bash for Chris Pratt's son with brother and mother

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