Susan Downey and Rachel McAdams light up premiere

Susan Downey wore a beautiful sequined black dress at the premiere of her husband, Robert Downey Jr.'s latest film, Sherlock Holmes: A Game of Shadows. Her dress was paired with glistening dangling earrings and a diamond-studded cuff bracelet. Even though she was all sparkles, the fashion jewelry didn't take away from the dress.

Downey beautiful jewels matched her glow, as the couple recently announced that they are expecting a boy. Downey appeared on the "Tonight Show with Jay Leno" on Monday night to promote his movie and let the information slip.

"I am not permitted to discuss it. I can't say a word... We're having a boy!" Downey blurted out at the show.

Downey has an 18-year-old son, Indio, from his previous marriage to actress and singer Deborah Falconer.

Rachel McAdams, who stars in the new film, looked nothing less than beautiful as well. Her glistening, silver floor-length gown was matched simply with earrings and studded diamond earrings.