Michael Phelps' Mystery Girlfriend Is 'Pretty Much Down for Any Type of Project (That Doesn't Involve Nudity)' Caity Weaver · 08/07/12 10:49AM The world was very excited to meet Michael Phelps' rumored girlfriend Megan Rossee when she stepped out with him in London on Monday night and now, after a cursory Googling of her name, the world has decided it hates her.