Anne-Marie tried to get James 'Arg' Argent drunk at a friend's wedding - not realising he's now teetotal.
The 25-year-old singer has confessed she wasn't aware that Arg had ceased drinking alcohol after previously battling addiction, and has also recalled how she auditioned for the 'Only Way Is Essex' star before she was famous.
She shared: "Arg didn't discover me. I was already singing around and he was judging this contest in Essex. I didn't win, so thanks Arg. But he liked me.
"I didn't see him again until my friend's wedding a few months back and I was trying to get him to drink some alcohol and he was like, 'No'."
Despite his high-profile battle with addiction, Anne-Marie revealed she was unaware that he'd given up drinking.
She told The Sun newspaper: "I didn't know he wasn't drinking alcohol - before that I was like, 'Wahey!'"
Anne-Marie's confession comes shortly after Arg checked himself into a self-help retreat in Thailand.
The reality TV star took some time off from filming the ITV show in order to focus on his well-being and jetted to a Thai retreat.
A source previously said: "Arg is in Thailand where he is trying to clean up his act. He wants to sort out his head and beat his demons once and for all.
"Being so far away from Essex and the bright lights is hopefully going to help him - acting as a kind of rehabilitation process. He is trying to make himself a better person and is doing some soul-searching.
"He wants to come back to the show stronger and is looking forward to doing so at some point in the future. Everyone just wants what is best for him."