Photo: Brigitte Nielsen/Instagram

Brigitte Nielsen/Instagramhttps://www.instagram.com/p/BmPVMaUBC4Y/

Brigitte Nielsenis working on her fitness.

The 55-year-old actress — who gave birth to her fifth child, daughterFrida, on June 22 — is striking a fierce series of posesin a photo collageshared to her Instagram account Wednesday.

In the snapshots, Nielsenshows off her figurein an all-white, body-hugging ensemble of cropped pants, a V-neck top and a jacket, topping off her look with a pair of earrings, sunglasses and silver sneakers.

Chloe Aftel

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Becoming a new mom again has left theBeverly Hills Cop IIstar feeling youthful. But Nielsen still has fears about howothers will perceive heras her daughter grows up.

She explained, “I’ll let my husband do it, because I don’t want people to say, ‘Is that your grandmothertaking you to school?’ I don’t want her to feel bad.”

Nielsen — also mom to sons Raoul Meyer Jr., 23, Douglas Meyer, 25, Killian Gastineau, 28, and Julian Winding, 34 — revealed to PEOPLE in July that she had welcomed Frida after more than a decade ofundergoing in vitro fertilization treatment.

“Some women think, ‘Oh my God, I’m too old.’ Well, yeah, I can understand people saying, ‘How dare she?’ ” the new mom of five said of her critics. “But how manymen have their first kids in their 60sand 70s and they never doubt it?”

“I totally, totally beat the odds. There’s a 3 to 4 percent chance of these things happening,” she added of her IVF journey. “Well, of course, this 3 to 4 percentdoes happen with somebody— and I was [that person].”

source: people.com