'Teen Mom 2' Star Leah Messer Admits She Cheated on Corey Simms a Week Before Their Wedding!

Although she's denied she ever cheated on her ex-husband and baby daddy Corey Simms, Leah Messer has finally come clean and confessed the truth over Twitter. 

The Teen Mom 2 star is sick of everyone talking about her and Corey's divorce and is setting the record straight. Sadly, she admits that she did cheat on Corey, allegedly with her ex Robbie Kidd. 

OK! GALLERY: OK!'S ULTIMATE TEEN MOM PHOTO GALLERY: MACI BOOKOUT, LEAH MESSER & MORE!

"Okay, I cheated a week before my wedding people. I'm tired of hearing about it," Leah, 19, Tweeted on Feb. 1. "At least I'm not a coward, and can admit my faults!" 

Back in February of last year, Robbie told OK! exclusively that he had cheated with Leah the night before she walked down the aisle with Corey. 

“I went over to her house after her bachelorette party died down,” Robbie, 19, (who dated Leah for three years), told OK!. “Her friends were still there — Leah and I went into her sister Victoria’s room, we talked a little and then we slept together.”

OK! NEWS: COVER STORY: TEEN MOM 2 STAR LEAH MESSER'S HEARTBREAK — SHE SUFFERS A MISCARRIAGE

"It was one of my regrets in my life, stop accusing and pointing fingers. Things happen to different people different ways. #GodsMyJUDGE," Leah added. "I can not not change whats happened! I can only be proud of where I stand now, and learn from it. I'm in no way proud of my mistakes... But last I checked we aren't proud of our mistakes." 

Robbie explained that Leah wouldn't leave Corey to be with him because she wanted her daughters, Aleeah and Aliannah, "to have their real father." 

Leah divorced Corey after six short months of marriage and is now engaged to boyfriend Jeremy Calvert.