The 27-year-old singer looked sixties chic as she donned a white crochet shift dress with high neck and short sleeves to attend An Evening With Women at the Beverly Hilton Hotel.
Simpson was thrilled to turn up for a cause close to her heart and tweeted about the gay, lesbian and bisexual celebration organised by Perry.
Alongside a picture of the singer songwriter she wrote on Twitter: ‘So happy to support @RealLindaPerry tonight! http://www.aneveningwithwomen.org Check it out! One love :)’
