Gary Oldman. Pic/AFP

Gary Oldman today clinched his career's first Oscar for Best Actor for his life-like portrayal of former British Prime Minister Winston Churchill in the period drama "Darkest Hour". The veteran actor was a spitting image as the UK PM who led Britain to an allied victory in the World War II in the Joe Wright-directed film. "Thanks for this glorious prize. I owe this and much more to so many," Oldman said in his acceptance speech.