by Natasha JokicBuzzFeedBuzzFeed StaffI'm a Senior Staff Writer at BuzzFeed covering pop culture, entertainment, and politics. Gwen Stefani explained her Christian pivot. ANGELA WEISS / AFP via Getty Images If you follow the No Doubt singer on social media, you may have noticed her promoting an app called Hallow. It's a Catholic prayer and meditation subscription service that's also had celebrities like Mark Wahlberg and Chris Pratt promoting it. Hallow / Via instagram.com However, the app is backed by JD Vance and billionaire MAGA donor Peter Thiel.