Rachel McAdams is opening up about the Mean Girls cast reunion in that recent Walmart commercial and she’s explaining why she didn’t join her former co-stars in the ad.

It seems that Rachel would’ve agreed to appear in the ad, but there was a bit of a misunderstanding on her part.

Keep reading to find out more…

Rachel explained in a new interview with Variety that she wasn’t aware that co-stars Lindsay Lohan, Amanda Seyfried, and Lacey Chabert were going to be in the ad.

“I don’t know; I guess I wasn’t that excited about doing a commercial if I’m being totally honest. A movie sounded awesome, but I’ve never done commercials, and it just didn’t feel like my bag. Also…I didn’t know that everyone was doing it. I would, of course, always love to be part of a Mean Girls reunion and hang with my plastics, but yeah, I found that out later,” she said.

Rachel said there were discussions for her to appear in the Mean Girls movie musical, but it didn’t pan out.

“Tina [Fey] and I sort of dabbled with a few ideas, but it was tough to make it all work in the end,” she said. “I was really down for whatever she wanted to do. I think the direction it went in will be fantastic and I cannot wait to see it.”

Renee Rapp, who plays Regina George in the musical movie, is reacting to Rachel‘s comments about her starring in the new movie.