Catelynn Lowell and Tyler Baltierra have been open about their checkered pasts — but apparently, there's one thing they HAVEN'T told us!

A new report claims the Teen Mom OG stars — along with two unidentified friends — were arrested in 2009 for marijuana possession, just one week after welcoming their daughter Carly and giving her up for adoption.

MORE: Find Out How Catelynn and Tyler Feel About Butch Baltierra's Return to Prison

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Today marks 11 years together with this amazing, selfless, beautiful & courageous soul. 11 years ago today, me & Cate sat outside on the curb in the trailer park & decided to be "boyfriend & girlfriend" & to look at us now, more than a decade later, is very surreal. They say teenage love doesn't last & that fairytale endings only happen in the movies…but I'm telling you, I'm living proof that it's possible. As long as 2 people commit to each other 100% & unconditionally love each other…nothing can break the spiritual bond created between them. Our relationship has gone through devastating lows that would tear a "normal" couple apart…but we are far from normal. Our spirits will forever be in a continuous unity & our love for each other will nurture that unity. I am so honored & blessed to have experienced the last 11 years of my life with a godsend angel that was destined to be cherished by me. I love you @catelynnmtv #HappyAnniversary #11Years

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“I arrived on the scene, and observed one of the male subjects throw something on the ground. The subjects then began to walk away," the responding officer from Marine City Police Department wrote in court documents obtained by Radar Online. “All four subjects advised that they were smoking marijuana.”

The site added their 20-day jail sentences were suspended indefinitely and they paid $200 fines.

Catelynn — who struggles with anxiety and depression — has been open about her pot smoking on this season of the MTV reality series, though admitted she wanted to stop after returning home from a 30-day rehab stint.

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