‘This Is Us’ Fans Have a Wild New Theory About Kevin’s Mystery Woman and It’ll Blow Your Mind

While This Is Us takes its fall hiatus, fans have to fill the void somehow. The fall finale left too many questions to let sit until the January return. Theories about Rebecca’s (Mandy Moore) health, Randall (Sterling K. Brown) and Kevin’s (Justin Hartley) falling out are among the top three theories keeping viewers busy.

However, the biggest mystery revolves around Kevin’s pregnant fiancé referenced in the 9-month flash-forward. The latest theory about who she is will have you rethinking every episode of This Is Us so far.

Kevin Pearson’s relationship timeline is messy, at best

Justin Hartley as Kevin Pearson on 'This Is Us'
Justin Hartley as Kevin | Ron Batzdorff/NBCU Photo Bank/NBCUniversal via Getty Images via Getty Images

To say Kevin has a few options in the relationship arena is, to put it mildly. As the star of [the fictional show] The Manny, Kevin grew accustomed to the limelight on, and off, the stage.

As previous episodes indicate, Kevin may revel in good looks and muscle on the outside, but his insecurity and low-self-esteem have always gotten in his way.

Even in childhood, Kevin felt the need to compete with adopted brother, Randall, for Jack (Milo Ventimiglia) and Rebecca’s attention. He’s the twin that never felt good enough, seeking validation everywhere he could find it (or falling victim to dangerous vices to cope otherwise), so he sought solace in relationships.

Fans know and love Kevin’s greatest love story, Sophie, whom he married and divorced out of high school only to rekindle that love twice over, and mess up, twice over. He developed feelings for the leading actress and screenwriter of the play he starred in, then Zoe, and finally Cassidy (Jennifer Morrison).

One of Kevin’s weaknesses is acting on impulse and falling too quickly, too fast. It’s never been clearer than the 9-month flash-forward shown in the tail end of the fall finale when, during Kevin’s 40th birthday, it’s revealed he’s not only engaged but about to be a father. It’s about to get complicated.

Here’s why it probably won’t be any of these women

It’d be a little too easy to guess that Cassidy is the mystery woman. the two may have just slept together before they parted ways, but This Is Us writers don’t tend to go for the obvious.

The next obvious choice is Sophie. Many fans say they’re endgame material, which isn’t completely off the mark. Kevin and Sophie have history, but just because they love each other doesn’t mean they should be together. Kevin hurt Sophie and she may not want to re-open those wounds.

If you go back into Kevin’s relationship timeline one more, you could guess he’ll end up with Zoe after all. He did just creep on Zoe’s Instagram with Cassidy. The fact that she didn’t want kids before they broke up doesn’t mean she won’t change her mind.

There are other guesses, such as Kate’s (Chrissy Metz) friend, Madison (Caitlin Thompson), or the girl he went on a date with right before he slept with Cassidy. However, there’s one new theory that blows all of these guesses out of the water.

The latest theory about the mother of his child is a wild one

View this post on Instagram

This is 40. #ThisIsUs

A post shared by This Is Us (@nbcthisisus) on

Take a deep breath before reading this one. Ready? On a post by the official, This Is Us Instagram account asking for “best theories about Kevin,” one commenter mentioned “Jack’s brother,” which, no, but another weighed in with a whopper.

“I’m thinking that Dejas Mom will get with Randall’s brother.”

Then another chimed in adding, “OMG that would explain why Randall and Kevin don’t talk.”

Once the theory was out there, it didn’t take long for others to comment in agreement. Though Kevin’s son in the season 3 flash-forward may not appear to be a child from Kevin and Shauna (Joy Brunson), it’s not that far out of the realm of possibility.

That kid could be adopted, one of multiple kids, or any other random scenario. Who Kevin intends to marry may very well be part of the rift between him and Randall — especially if it’s the mother of Randall’s adoptive daughter.

It might be far-fetched, but we have to say, it sounds more like something the crafty This Is Us writers would do to unsuspecting viewers. Now that we’ve put it out there, feel free to re-watch every episode with Kevin and Shauna to see if there’s any suspect chemistry in the works.