Baby on board: Chrissy Teigen took to social media late Monday to reveal the big news that she and John Legend are expecting their first child. The happy news comes just weeks after the 29-year-old model spoke of her heartbreak as
 

The Sports Illustrated cover girl posted a sweet black and white shot of herself and her musician beau on Instagram to announce they are expecting their first child.

The star wrote: 'John and I are so happy to announce that we are pregnant :).