Irish model and actress who rose to stardom through her role on BBC's Merlin from 2008 to 2012. She appeared in NBC's Dracula from 2013 until 2014 and in The CW's Supergirl, beginning in 2016. She was also cast as Zara Young in the 2015 feature Jurassic World.
She was employed as a wardrobe assistant on The Tudors.
She wanted to work in fashion journalism and briefly worked at Image magazine.
Her parents are Mary and Paul McGrath. She was raised with two brothers named Sean and Rory. She dated British actor Joe Dempsie in 2010. Subsequently, she began dating her Merlin co-star Colin Morgan; they got engaged in 2016.
She co-starred in the 2009 mini-series The Queen alongside Emilia Fox.