Charli XCX is going vampire and the rest of us are just suckers for it. The "Break the Rules" singer teamed up with Vampire Weekend multi-instrumentalist Rostam Batmanglij on Late Show With David Letterman and everyone was glamoured.

Charli seduced audiences as she sexily writhed on the piano.

 "Sucker" was co-written by Batmanglih, who also produced the song.

Charli XCX release her sophomore album, "SUCKER" on via Neon Gold/Atlantic Records, on Monday, December 15. The new Charli XCX album includes the new single, "Break The Rules" and the top 10 smash, "Boom Clap." "Boom Clap" hit No. 8 on Billboard's Hot 100 after it was featured in the blockbuster "The Fault in Our Stars."

Charli XCX has been promoting "SUCKER" with high profile media appearances like NBC's Saturday Night Live. But her performance on CBS' Late Show with David Letterman cast a spell on the audience. She recently performed "Boom Clap" and "Break The Rules" on the 2014 MTV Europe Music Awards and the American Music Awards 2014 on ABC.

Charli XCX, whose real name is Charlotte Aitchison, played  Z100's Jingle Ball 2014 extravaganza at New York City's legendary Madison Square Garden on Friday, Dec. 12.

Charli XCX recently hit the KIIS-FM Jingle Ball, bringing punk attitude to her pop sensibilities. She slammed down her microphone at the end of her performance, underscoring the punk pulse of her new album "Sucker."

Charli will next be seen at Miami's Y100 Jingle Ball on Sunday, December 21st), and Tampa's 93.3 FLZ Jingle Ball (Monday, December 22nd).

Charli XCX will join be Katy Perry's  special guest on the European leg of the "I Kissed a Girl" singer's "Prismatic Tour." Charli will then headline her own eight-city tour of the United Kingdom. She will announce North American tour dates soon.

Charli XCX also showed up on Icona Pop's "I Love It," which she co-wrote, and sang the hook on Iggy Azalea's song "Fancy." 

You can watch Charli XCX on David Letterman's Late Show here: