It is a big day for Bridgerton fans everywhere, and that includes show star Nicola Coughlan! Nicola shared a sweet message to her followers on social media, as the first part of Bridgerton season four arrives on Netflix. Nicola Coughlan on set of Bridgerton. Pic: Nicola Coughlan/InstagramShe also shared a Polaroid snap of herself posing alongside newcomer Yerin Ha, who she described as their 'leading lady.' Nicola Coughlan and Yerin Ha.