Brittny told us how she was shocked to discover she has a half-brother named Killian Marcus Gastineau.
Nielsen, who was briefly married to Sylvester Stallone after appearing with him in “Rocky IV” (1985), had an affair with the Jets’ leading quarterback-sacker in 1988. But the Danish beauty then moved back to Europe, where she starred on Italian TV and made a string of low-budget films.
Brittny said she had heard rumors, but never knew her brother existed until her mother, Lisa, bumped into Nielsen at Ivana Trump’s wedding last April.
“Brigitte literally said to my mom at Ivana’s wedding: ‘I have a son who wants to meet his sister,’ ” Brittny said.
The reality-show beauty had an emotional first meeting with Killian, who goes by the name Marcus, in LA over the weekend.
“Meeting my half-brother for the first time was really very weird and very emotional. The brother I never knew I had — it’s a lot to take in . . . All my life, I’ve always said I wanted a brother. I definitely want us to be close,” Brittny said.
“I feel sad that I’ve had a brother for 20 years that I never knew growing up. He’s very tall and blond, and looks identical to Brigitte. He doesn’t speak much English because he grew up in Italy. He’s really sweet.
She added: “Marcus also met dad for the first time a few days before he met me. He said it went well. I have no relationship with my father.”
Mark Gastineau was still married to Lisa when he took off with Nielsen. Killian Marcus was born in December 1989 in Arizona, but grew up in Milan after Gastineau and Nielsen split. Mark Gastineau could not be reached.
