The annual Vanity Fair Oscar Party was the most star-studded event of the night.
Inside, Oscar winners Emma Stone, Mahershala Ali and Viola Davis gathered alongside Katy Perry, Ciara and Jessica Alba and more to celebrate Hollywood's biggest night.
In February, Rosie posted a photo taken by soon to be dad, Jason, on Instagram announcing her pregnancy "Very happy to share that Jason and I are expecting!!
Rosie Huntington-Whiteley attends the Moet & Chandon Etoile award ceremony to honour Mario Testino for his contribution to cultural society at Park Lane Hotel on September 19, 2011 in London, England.
Little is known about Fiona’s side of the family, but Rosie’s father is descended from a line of baronets with royal connections.
His great-grandfather, Sir Herbert Huntington-Whiteley, a Conservative MP, was made a baronet in 1918.
Congrats to the happy couple on the wonderful news!
We can’t wait to see more photos of the little one.