'XO, Kitty': Anna Cathcart on Evolving Kitty From Little Sister to Romantic Lead (Exclusive)

Kitty Song-Covey is all grown up in ‘XO, Kitty!’ Anna Cathcart opens up to ET’s Deidre Behar about Kitty’s evolution, from 13-year-old little sister in ‘To All the Boys I’ve Loved Before,’ to now playing the romantic lead. Anthony Keyvan, who plays Kitty’s on-screen BFF, reacts to being a part of the series and why he was nervous preparing for the role. Plus, both actors share how the cast bonded over karaoke nights while filming in Seoul. 'XO, Kitty,' premieres May 18 on Netflix.