For her role in Paul Thomas Anderson's fashion drama "Phantom Thread", the 61-year-old actor was nominated for the Best Supporting Actress Oscar, which ultimately went to Allison Janney for "I, Tonya".
Manville, who was married to Oldman from 1987 to 1990, said their night at the Oscars felt like a "family evening".
"Of course, everyone wants the story that I'm sour-faced about it. But I'm not remotely sour-faced. Listen, we have a child together, we're a very successful family... he's got a new wife, and we all get on. Everyone gets on," Manville told BBC Radio 4's Today programme.