Brigitte Nielsen is pregnant at 54

This will be the actress' fifth child.

Danish actress Brigitte Nielsen is expecting a baby, she announced Wednesday.

"happy time positive vibes #happyness [sic] #positivevibes," she captioned one shot.

This will be the fourth child for Nielsen, who has been married to her current husband, Mattia Dessi, for more than a decade. She also has four sons, ages 34, 28, 25 and 23, from previous relationships.

"I would love to because of all the things I have learned. It would be like starting all over again. But am I too old? I'm young at heart and I would be different this time round," she said. "Mattia and I have discussed it, but I don't know how likely it is. And to interfere with things just because I feel as if I could give more to a child than I did when I was 20 – is that too selfish? I don't know."

A representative for Nielsen did not immediately respond to ABC News' request for comment.