Chrishell Stause wasn't afraid to tell Gwen Stefani exactly how she feels about the singer partnering with prayer app Hallow. "Gwen-DON'T SPEAK," the Selling Sunset star, 44, wrote in the comments section of an Instagram Reel about Stefani's ad, referring to No Doubt's 1996 hit. "Please take your own advice on this onešŸ« ." Earlier this month, Stefani, 56, shared an Instagram Reel marked "paid partnership" that showed her talking about Hallow, "a Christian prayer app that offers audio-guided meditation sessions to help us grow in our faith & spiritual lives and find peace in God.