Bridesmaids star Jessica St. Clair is a new mum after giving birth to a baby girl last week (01Oct13).
Little Isobel Kelly O'Brien was born in Santa Monica, California.
The child is the 36-year-old actress' first with husband Dan O'Brien.
A spokesperson for the couple tells People.com, "Everyone is healthy, happy and doing great."
The cast had teased something big was coming and all was revealed on Monday night.
The couple have recently found themselves dragged into the Brangelina divorce and even forced to deny split rumours.
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