The actress walked the red carpet on Friday at the American Film Institute Awards luncheon to promote the new film.
She was nominated for her work in Only Murders in the Building in the Best Actress in a Musical or Comedy TV series category.
This is the first time the couple has confirmed their pregnancy since debuting a baby bump at a Garrard event in October when she wore a tight blue dress.
She also posted an Instagram Story picture of Rhodes’ cake- a blue car- which had the digit “2” inscribed on it.
Monet also posted a screen recording as she updated the contact name of her 34-year-old partner on her phone from “My Baby” to “Husband.”
Nyong’o, who is a very private person, has in the past shot down rumors of her dating Michael B. Jordan and Jared Leto- separately.