Kaley Cuoco and Karl Cook The Big Bang Theory actress got engaged to equestrian Karl Cook on her 32nd birthday in November. Karl shared a video of the emotional moment when he popped the question on his Instagram, writing, "Well after nearly two years I finally got up the courage to ask her to marry me. This is the best night of my life and I think the video shows it is the best night for Kaley as well." Image Source: Getty / Todd Williamson