Ellen Pompeo and Mariska Hargitay will also star in Taylor Swift's 'Bad Blood' video

Are you keeping up? Ellen Pompeo and Mariska Hargitay have become the latest in a long, long list of stars confirmed for Taylor Swift's 'Bad Blood' video.

The actresses will play the characters of Luna and Justice respectively, Swift announced on her Twitter feed.

Meet Luna.

@EllenPompeo
#BadBloodMusicVideo pic.twitter.com/aDuOgmUv2L

— Taylor Swift (@taylorswift13) May 14, 2015

Jessica Alba, Karlie Kloss, Lena Dunham, Hailee Steinfeld and Kendrick Lamar were previously confirmed for the music video.

Paramore's Hayley Williams, Ellie Goulding, Gigi Hadid, Zendaya and Lily Aldridge will also star.

Directed by Joseph Khan, the visual will debut at the 2015 Billboard Music Awards on Sunday, May 17.

Meet Justice.

@Mariska
#BadBloodMusicVideo pic.twitter.com/gZK3VhnbOy

— Taylor Swift (@taylorswift13) May 14, 2015

Swift has said that each person involved in the video chose their own persona and character name.

'Bad Blood' is the fourth single to be taken from Swift's album 1989, following the releases of 'Shake It Off', 'Blank Space' and 'Style' in recent months.

Watch the music video for 'Style' below: