The rapper took to Twitter on Thursday to post a picture of herself and Kesha horse-riding and captioned it:
"Me and the very funny @KeshaRose on defender and biz! #FreeKesha (sic)."
Iggy's message of support for Kesha came just one day after Kesha's appeal to be released from her record label was rejected in court.
The Tik Tok hitmaker has been fighting to have her contract with Sony Music terminated after she alleged she was sexually abused by producer Dr. Luke.
Of their decision, a judge said: "Although Luke's alleged actions were directed to Kesha, who is female, her claims do no allege that Luke harbored animus toward women or was motivated by gender animus when he allegedly behaved violently toward Kesha ... Every rape is not a gender-motivated hate crime."