It’s no longer a question of “Who’s the baby daddy?” … because Paul Pierce is admitting he fathered Princess Santiago ’s child. According to court docs obtained by TMZ, the NBA legend told the court he was the biological dad to 2-month-old King Rafael Santiago Pierce . He asked for joint legal and physical custody. As we’ve previously reported , she’s asking for sole legal and physical custody -- plus a hefty $29,811 per month in child support, $100K in legal fees, and nearly $19K in pregnancy-