Jessica Kelly Siobhán Reilly (born 18 July 1977) is an English actress.
She first appeared on screen in 1995 in the series The Biz. Her other television work includes lead roles in the British crime drama Above Suspicion (2009–2012), the American psychological medical drama Black Box (2014), the American anthology crime drama True Detective (2015), and the historical fantasy drama Britannia (2018). As of 2018, she has played Beth Dutton in Paramount Network’s neo-western drama series Yellowstone opposite Kevin Costner.
