It all started when the rocker, 48, who has been plagued with personal problems in her own life, offered some words of wisdom to Bynes.
Love tweeted : “@AmandaBynes pull it together dude”.
Bynes then replied, “Courtney Love is the ugliest woman I’ve ever seen. To be mentioned by her at all makes me and all my friends laugh!,” the New York Post reported.
Amanda caused outrage after appearing to tweet a racist remark at popstar Rihanna and suggesting she was assaulted by Chris Brown because she "isn''t pretty enough" - but later denied the posts and claimed it was fake.