Oh my, what have we here?

Fans of Teen Mom OG know that Amber Portwood and Matt Baier called it quits — so we find it rather interesting that he is currently in Las Vegas, the same place where he met up with his alleged mistress Tiffany Bassett.

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Matt shared this Instagram pic with former baseball star Pete Rose and tagged Sin City as his location — and many can’t help but wonder not only who he is with on this trip, but if he met up with the tattoo artist. She told all about their encounter back in May during an interview with All About the Tea.

“Matt contacted me about investing in a new shop and was interested in telling my story in the process. I was excited to possibly land a celebrity client, as well as a new business venture,” Tiffany, who is in remission after battling cancer, told the publication. “Matt began sending me provocative text messages, including a d–k pic. I went along with it, hoping that it would eventually pay off for my business. My motive was always business and providing for my three children.”

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She also alleged that they hooked up twice when they met up there — while Amber and her brother, Sean Portwood, and Matt’s friend Jeff were visiting. The first time she said happened willingly, while the next time was rather suspicious.

“Two o’clock in the morning, Matt comes into my room, supposedly to pick up some souvenirs left on the table. He just wakes me up and decides that we’re going to have sex. No warning — no nothing. I’m like shaking, I froze — I didn’t do anything to stop it,” she recalled.

We can’t imagine that Amber is pleased about her ex’s latest adventure, considering earlier this month she called him out for drinking.

“Been [two] days and [Matt] is already posting videos on Instagram of him at someone’s house with 50 bottles of liqueur everywhere..it’s on,” she tweeted at the time.

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It doesn’t sound like these two will be making amends anytime soon.

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Scroll through the gallery to relive Amber and Matt’s relationship.