"For the first time, I had the most amazing person to come home to when the crowds were all gone and the spotlight went out, so I'd like to thank my boyfriend Adam for that," Swift said, using her beau's real name, which is Adam Richard Wiles.
Swift, 26, was also honored with the prizes for Female Artist of the Year and Album of the Year for 1989.
Adele's "Hello" was named Song of the Year, Justin Bieber was deemed Male Artist of the Year and Fetty Wap was declared New Artist of the Year. Maroon 5 took home the award for Duo or Group of the Year.
Jason Derulo hosted the event at The Forum.