Watch: Tobias Jesso Jr. and Haim perform 'Forever' together live.

At Tobias Jesso Jr.’s Los Angeles show this past Friday, he invited the Haim sisters to join him on-stage in a rendition of 'Forever' - during which he abandoned his piano and showed off some dance-moves instead.

Yes, that is Tobias in the Bigfoot costume.

Watch the performance below...

P.S. Tobias is playing Laneway Festival 2016! Click here for more info.