During a promo run for her debut album, 'LP1,' FKA twigs stopped by BBC Radio 1's 'Live Lounge' last week to perform her new song 'Two Weeks' and a cover of Sam Smith's smash hit 'Stay With Me.'

Dressed in all black, the 26-year-old old British songstress steps into a blue-lit room to share her emotional and fluid performance style. During 'Two Weeks,' she puts all of her energy into the lyrics though she looks quite relaxed while singing the ballad. Being the dancer that she is, twigs shows off some of onstage moves -- just a more subtle here.

As part of the 'Live Lounge' tradition, each artist has to pick a song to cover, and twigs takes on the equally emotional 'Stay With Me' by fellow Brit Sam Smith. Of course, the 'Pendulum' couldn't go for the straightforward singing approach.

Layered with atmospheric, trippy sounds, her vocals sounds a bit fuller than her breathy tone on 'Two Weeks.' Her rendition of 'Stay With Me' is more sultry than sad and flirtatious rather than heartwrenching -- definitely a different twist to the power ballad.

Watch FKA twigs Perform 'Two Weeks' on BBC Radio 1's 'Live Lounge'