The gig marked the last date of Cyrus' 'Dead Petz' tour with The Flaming Lips
Cyrus was performing at The Wiltern in Los Angeles over the weekend when Anderson joined her during a rendition of hit ‘We Can’t Stop’.
Famous animal rights activist Anderson held up a sign reading “Save the whales” during the performance, while Cyrus donned fake breasts and a prosthetic penis.
Watch footage below.
Meanwhile, Miley Cyrus recently dressed like a baby in the video for her Flaming Lips collaboration, ‘BB Talk’.
The video was directed by Cyrus and regular collaborator Diane Martel (who shot the ‘We Can’t Stop’ video) and shows Cyrus dancing in a cot and taking a bubble bath with an oversized plastic duck.
‘BB Talk’ features on ‘Miley Cyrus and Her Dead Petz’ experimental album, released in August. This latest video follows the similarly attention-grabbing visuals for album track ‘Lighter’.