The very famous face you missed in Romy and Michele's High School Reunion.

It’s been 20 years since Romy and Michele’s High School Reunion first hit cinemas.

It was one of the funniest and most popular movies of the 90s. It garnered a huge cult following and made high school students everywhere daydream about their own reunion and how they would definitely be thinner, richer, and totally famous by then.

Plus it gave us so many great quotes and a penchant for dramatic dance offs to Cyndi Lauper’s Time After Time when we’d had one too many Raspberry Cruisers.

The movie follows underachievers Romy (Mira Sorvino) and Michele (Lisa Kudrow), who visit their hometown of Tuscon for their 10-year high school reunion, in the hope of making their old high school bullies jealous of their post-school success.

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TIME AFTER TIME. Image via Touchstone Pictures.

Of course, this does not go to plan, and Romy and Michele learn a lot about themselves and each other along the way.

Here's a few things you may have missed about the classic film over the years:

1. Justin Theroux played the mysterious cowboy Clarence. 

Long before Justin Theroux was married to Jennifer Aniston, he made a cameo appearance in Romy and Michele as the mysterious cowboy Clarence who torments but ultimately woos Janeane Garofalo's character Heather Mooney. It was only his second movie role.

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The future My Aniston. Image via Touchstone Pictures.

2. The film started out as a play.

The film is based on an original play by eventual screenwriter Robin Schiff called “Ladies’ Room,” which featured Romy and Michele as marginal characters and took place entirely in a Mexican restaurant bathroom during happy hour.

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3. Most of the actors were twice the age of the characters they played. 

While they had to play teenagers for the film’s high school flashback scenes, several of the main actors were actually well into their 30s. Lisa Kudrow was 33, while the oldest ‘teen’ was The Practice's Camryn Manheim, who was 36 when she played dorky high-schooler Toby Walters.

4. Alan Cummings made three cameo appearances. 

The Good Wife actor played three roles in the film - the high school version of the nerdy Sandy Frink, the beefed up hunky version in Michele's dream sequence, and the real life older version of the character who appears at the high school reunion in a helicopter, having become very rich after discovering a new form of rubber.

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The Good Wife actor played three roles in the film. Image via Touchstone Pictures.

5. Lisa Kudrow improvised the post-it note scene. 

One of the most iconic scenes from the film is when Lisa Kudrow's character tells her high school bullies that she and Romy invented post-it notes.

Apparently, Kudrow improvised most of this scene, even making up the line 'a special kind of glue'.

6. There was sequel that no one watched. 

The popular film was followed up with a sequel (or prequel) called Romy and Michele: In The Beginning, that went straight to TV. Romy and Michele were played by American Horror Story’s Alexandra Breckenridge and a pre-Grey’s Anatomy Katherine Heigl.

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7. There could be a new sequel in the making. 

When Mira Sorvino attended a special screening of the film this week for the 20th anniversary, she hinted that there could be sequel in the future.

“We’ve always been interested, and it sounds like you’re interested, so hopefully yes, but I can’t say. Robin (Schiff) would write it and we would be in it and we would love you to come see it.”