Robin Thicke and his "Precious" actress wife Paula Patton welcomed their first child yesterday in L.A. -- forcing the R&B singer to bail on his show last night.

Thicke's rep tells People, "Mother, father and son are all doing well."

The singer pulled out of his Alicia Keys show for "personal reasons" -- A.K.A. the birth of new son Julian Fuego -- but that didn't stop Alicia from offering her congrats onstage.

Thicke and Patton will celebrate their 5-year anniversary in June.

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