Taylor Kinney is an American actor and model, known for his starring role as Kelly Severide in NBC's Chicago Fire. He also starred as Mason Lockwood in The Vampire Diaries, as Glen Morrison in Trauma, and Luke Gianni in Fashion House. He's also appeared in films including Zero Dark Thirty, The Other Woman, and Here and Now. In 2011, Kinney was featured in Lady Gaga's music video "Yoü and I". Soon after, he and Lady Gaga started dating and they became engaged in February 2015, but ended up calling off their engagement in July 2016.