Article continues below advertisementGwen Stefani was ripped by fans for promoting a prayer app known for its pro-life views. "Joining @jeffcavins this Lent on the @hallowapp as part of their prayer challenge leading up to Easter," Stefani, 56, shared a video promoting the religious app via Instagram on Wednesday, February 18. Article continues below advertisementGwen Stefani Promoted Prayer App Ahead of Easter Source: MEGAGwen Stefani promoted a prayer challenge on a religious-based app.