Swift, 24, who performed at last year's Grammy award, is up for the coveted Album of the Year award for her hit record 'Red', reported Ace Showbiz.
McCartney, 71, and Starr, 73, will accept the Lifetime Achievement Award as the members of popular band The Beatles in addition to performing.
Other just announced performers are Kacey Musgraves, John Legend, Keith Urban, Sara Bareilles and Carole King.
These stars are joining previously-announced performers, who are Imagine Dragons, Kendrick Lamar, Pink, Nate Ruess of Fun., Daft Punk, Pharrell Williams, Stevie Wonder, Lorde, Katy Perry, Robin Thicke and Metallica.