Vicki Peterson of The Bangles and her sister-in-law Susan Cowsill, of the 60's group The Cowsills, are performing together as The Psycho Sisters.

They've been performing for over 20 years, but they've never released an album, until now.  Their debut, Up On The Chair, Beatrice -- which they funded through Kickstarter -- is being released this week..

This past Sunday, the duo played a house concert in Los Angles to benefit Autism Think Tank.  They were joined there by John Cowsill -- who is Vicki's husband and Susan's brother.  See...all in the family.

We've got the 1986 hit from The Bangles, "If She Knew What She Wants" from iHeartRadio, featuring Vicki Peterson.