Bjork will perform at the Oscars with a 55-piece orchestra.
The Icelandic singer has been nominated for Best Original Song for I've Seen It All.
It's a duet with Thom Yorke from Radiohead.
The tune's taken from Selmasongs, the soundtrack to award-winning musical Dancer In The Dark.
According to Bjork's official website, she will perform with the orchestra at the ceremony at the Shrine Auditorium in Los Angeles on March 25.
Other nominees in the Best Song category include Bob Dylan for Things Have Changed from the film Wonder Boys, and Sting for My Funny Friend And Me from The Emperor's New Groove.
Bjork's next album Vespertine is due for release in May.