E! News has confirmed the actress gave birth to the couple's first child in Los Angeles. No other details are available at this time.
A source confirmed the surprising news of Mendes' pregnancy after it was first revealed in July through media reports which claimed she was seven months pregnant with the hunky Hollywood beau's child.
The super-private Place Beyond the Pines star was been able to keep her baby bump under wraps by not being photographed for more than three months at the time, and sticking to loose-fitting and patterned clothing.