Dean McDermott and ex-wife Mary Jo Eustace attend son Jack’s graduation

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Dean McDermott and his ex-wife, Mary Jo Eustace, put on a united front at their son Jack’s college graduation Thursday.

The 23-year-old San Francisco State University grad was all smiles in a purple cap and gown with his divorced parents after the ceremony.

“So proud of this young man!!” McDermott, 55, captioned a family photo via Instagram. “He graduated SFSU today!! So grateful to take part in this celebration and journey with @jackmonty and @maryjoeustace.”

Eustace, 60, posted a picture of her own, captioned, “Bliss with the graduate. #love.”

Jack’s stepmom, Tori Spelling, did not appear to attend the ceremony. (She and McDermott have been at the center of split speculation since last year.)

The former couple posed at the San Francisco State University ceremony.