While Karen O has been slated to perform the Oscars for weeks, it appears she'll be joined by Vampire Weekend's Ezra Koenig when she takes the stage this Sunday.

According to the AP's report on Friday's rehearsals, Karen O was "accompanied by [Koenig] on acoustic guitar, O sang the song again and again, sitting on a corner of the stage in a long floral dress, leather motorcycle jacket and killer blue boots."

The Yeah Yeah Yeahs frontwoman is set to perform "The Moon Song" from Spike Jonze's Her. Last month, she released a new duet version of the track, joined by Koenig.