Liev Schreiber and Naomi Watts were one big, happy blended family while celebrating their son Sasha's high school graduation .

The exes reunited on Thursday, June 5, to watch Sasha, 17, walk across the stage and receive his diploma. "The graduate!!!," Schreiber, 57, captioned a family photo from the afternoon.

In the snap, the Perfect Couple actor and Watts, 56, flanked their son. Schreiber's wife, Taylor Neisen , and Watts' husband, Billy Crudup , were also part of the graduation crew and posed with the proud mom and dad .

Schreiber wore a navy suit and blue undershirt and had a camera hanging around his neck, while his wife opted for a denim dress and yellow handbag. Watts was ready for summer in her floral dress and straw sunhat. Crudup, meanwhile, wore navy sla

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