It's not often that fans get to see a dramatic beauty transformation from Rachel McAdams, but the actress's new dark-brown hair color may just be one of her most notable changes ever. McAdams showed off the brand-new rich chocolate hue during the opening night of An Enemy Of The People on Broadway. The play, which was originally written by Henrik Ibsen, stars Jeremy Strong, Michael Imperioli, and Victoria Pedretti, but McAdams's deep brown hair may have stolen the spotlight, especially if fans recall that she had blonde hair earlier this month at the premiere of the Manhattan Theatre Club's production of Mary Jane (it also appears that McAdams is really soaking up all the theater she can). 

Last night's premiere also included appearances from Adam Driver, Kit Connor, Dan Stevens, Marisa Tomei, and F. Murray Abraham. In addition to giving her long, brown hair a moment to shine (she wore it in tight waves and parted it deep on one side), McAdams wore an inky, dark-blue leather skirt with a long trailing belt and a ribbed turtleneck sweater. She finished her look with a stack of bracelets and shimmering stud earrings.

This is far from the first time that McAdams's hair has made headlines. With the new Mean Girls movie musical streaming and everyone rediscovering their love of the original film, tidbits about the classic teen comedy are resurfacing. Rajiv Surendra, who played Kevin Gnapoor in the 2004 film, reminded everyone that Regina George's signature blonde hair was actually a wig. Speaking to Seventeen in 2016, he explained that McAdams didn't want to bleach and damage her natural hair for the movie.

"Rachel McAdams' blonde hair is not her hair in the movie," he shared when asked to drop a little-known fact about Mean Girls. "They had a wig made out of human hair by a well-known wig maker from this little town called Stratford, Ontario. I don't know if this is actually true, but I remember hearing something about Rachel not wanting to bleach all of her hair. So, the front bit was bleach blonde, so that was her real hair, but the wig was fake."

But that's not the only eyebrow-raising fact about the wig. Surendra also shared the price tag for a wig from a well-known Canadian wig maker.

"I remember walking into the makeup and hair trailer regularly and seeing the wig being washed," he finished. "They actually would wash it and put this little shower cap thing on it that they would hook the blow dryer onto that would dry the wig. It was like a $10,000 wig."