I could have swore the last one was Gwen Stefani. I've only heard this girl's name but had never seen her, she's identical to Gwen in this photo although I only saw her eyes and one cheek.
I think the greyscale and only seeing part of the face must have tricked you; Janelle Monáe and Gwen Stefani look very different in real life. Many people will have most recently seen Janelle Monáe in Glass Onion.
The quiz references images from Wikimedia Commons, so Lizzo's picture must have been removed from there. I'll fix it soon. Thank you for pointing it out.
Thanks for the nomination.