Big Brother's Season 20 houseguest, Kaitlyn Herman, has gone public with her relationship with Big Brother Canada sixth-season finalist Derek Kesseler.

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On Sunday, both Kaitlyn and Derek shared the same selfie of each other on Instagram. The couple appeared to enjoy a romantic, sunny hike together.

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"You were the last thing I ever expected @derekjacobkesseler," Kaitlyn, 24, captioned the image on her Instagram Story.

Kaitlyn was evicted from the Big Brother house on July 26 after spending four weeks in game. As for Derek, 27, he finished in third place during his season earlier this year.

When Kaitlyn, a life coach from New York who currently resides in Encino, CA, entered the Big Brother house in June, she was in a long-term relationship with DJ Joe Pincus.

During the game, however, Kaitlyn was accused of manipulating and flirting with men in the house despite having a serious boyfriend back home. (Sam Bledsoe even called Kaitlyn's gameplay "cheap" and said she disrespected herself and others).

Kaitlyn admitted to fans on Instagram Live in late July that she and Joe were "taking a little bit of space."

But shortly after her eviction, Kaitlyn was hoping Joe would stand by her, telling TV Guide she wasn't sure how the deejay was feeling about her flirtatious behavior in the house, which included lying in bed with Tyler Crispen and claiming she'd like to kiss him.

"What I do know is that Joe knows who I am at my core. He knows I am an affectionate person but he also knows how deeply, deeply in love with him I am," Kaitlyn explained at the time.

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"Hopefully he was able to watch the show and understand my strategy."

Kaitlyn also seemed to have a crush on her "best friend" in the house, Faysal Shafaat.

Joe, however, had made it known while Kaitlyn was playing the game this past summer that he didn't appreciate Kaitlyn's antics in the house. In fact, he released a statement on Twitter, suggesting he was done with his then-girlfriend of five years.

"I tried to stay silent but clearly that isn't an option as I've been overwhelmed with the volume of everything on TV and social media. I've been trying to separate myself from the show and the situation as much as possible," Joe wrote.

"I did indeed request (not demand) for [my] 'show release' to be pulled, and that is still to be determined (I'm aware people in past seasons have done this). All other accounts reporting 'insider info' are lying to you or twisting a story."

Joe refused to comment any further on his girlfriend's actions, except for saying he'd be "focusing on my family and friends, wellbeing and my music" going forward and he was thankful to the people who were "not pushing a false narrative."

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Big Brother's 20th season ended with Kaycee Clark winning the $500,000 grand prize and Tyler finishing as the runner-up as well as "America's Favorite Houseguest."