Paul Pierce's Baby Mama You Forgot About Our Baby Boy on Father's Day!!!

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Paul Pierce's Father's Day came with some serious drama ... 'cause Princess Santiago says the basketball Hall of Famer forgot all about their baby boy ... something she claims is becoming a theme.

Princess unloaded on Paul in a series of Instagram posts Sunday ... blasting the former Celtics star for celebrating Father's Day online while allegedly failing to spend time with their infant son, King.

Her posts centered around a Father's Day tribute Paul shared featuring four of his other children ... with Santiago claiming King -- who is approaching 5 months old -- was notably absent from Paul's plans despite being the first Father's Day since King's birth.

Paul Pierce Baby Mama Spotted For First Time ... After He Admits He's the Father

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Paul Pierce's baby mama Princess Santiago isn't hiding out after the former NBA All-Star's bombshell admission ... and she's got the child right by her side.

Santiago was spotted out in Beverly Hills on Tuesday for the first time since Pierce admitted to being the father. She was seen grabbing a bite at an outdoor restaurant ... calmly cradling her 2-month-old son King Rafael Santiago Pierce as the custody battle with Pierce plays out behind the scenes.

The vibe was low-key and all about mom duty. In the pics, she keeps things intimate, holding the baby close and even leaning in for a sweet kiss ... clearly locked in on her newborn despite the headlines swirling around her.