Then: Lisa Kudrow
Whilst filming for the popular American television series Friends, Lisa found time to play the quirky and ambitious character, Michele Weinberger, on Romy and Michele's High School Reunion. Shortly after the premiere in 1998, Lisa and husband Michel Stern gave birth to their son. Her pregnancy was well hidden while filming Friends as it co-ordinated with the episode where she played a pregnant Phoebe.
Now: Lisa Kudrow
Since the iconic movie, Lisa has appeared and starred in numerous other films, including animated comedy Boss Baby, The Girl on the Train alongside Emily Blunt, and Neighbours 2, which starred Seth Rogan, Zac Efron, Chloe Grace and Dave Franco. The actress has also made various appearances on the smaller screen including lending her voice for episodes of The Simpsons and American Dad.
Then: Justin Theroux
For those of you who might have missed this one, Justin Theroux does star in the movie! He plays Clarence the mysterious cowboy, although small, his part was known for the sultry stare and for being Heather's happy ending.
Now: Justin Theroux
Justin went from strength to strength after Romy and Michele's High School Reunion. Following the movie, he starred in the comedy Zoolander and later had a more serious role with fellow cast member Lisa Kudrow in The Girl on the Train. After writing the screenplay for Iron Man 2, Justin landed a reoccurring role on the police drama series The District. His love life is also going pretty well, Justin married critically acclaimed actress Jennifer Aniston in 2015.
Then: Alan Cumming
Alan plays the dorky teen, Sandy Frink, who grew up to be a millionaire inventor.
Now: Alan Cumming
Alan has had prominant roles in many family films including Spy Kids, The Smurfs and Garfield but he is also known for his large prescence in the theatre. Recently, Alan wrote an autobiography called Not My Father's Son, the book describes his experience on the U.K television show Who Do You Think You Are, where he and his brother underwent a DNA test to prove their disbelieving father that they were his sons.
Then: Elaine Hendrix
Elaine plays Lisa Luder, who outgrows the A-Gang and becomes the editor of Vogue.
Now: Elaine Hendrix
Probably most recognised for her role in the remake of the Parent Trap, Elaine Hendrix starred as Lindsay Lohan's evil wannabe step-mother as she played the character of Denise Quaid's fiancé. More recently she starred in the fantasy film Kids Vs Monsters in 2015.
Then: Vincent Ventresca
Vincent first appeared on our screens in 1991 on The Fresh Prince of Bel-Air, before landing his first movie role on Romy and Michele's High School Reunion where he plays popular heartthrob Billy, who grew up to be the opposite and married to Christie Masters.
Now: Vincent Ventresca
Vincent's career grew in television and he appeared in Friend's as 'Fun Bobby,' Monica's alcoholic boyfriend. He later went on to appear several times in CSI, CSI: NY and CSI: Miami until he landed a reoccurring role on Wicked City in 2015.
Then: Janeane Garofalo
The Heather Mooney character is remembered to have supported bitterness, black clothing and a lot of cigarettes.
Now: Janeane Garofalo
Janeane went on to perform in a variety of leading and supporting roles in more than 50 feature films before changing to off-screen in 2004 and becoming a co-host for Air America Radio.
Then: Mira Sorvino
Although Mira plays ditzy blonde Romy White in the movie, she is nothing like her character, having graduated from Harvard University in 1989.
Now: Mira Sorvino
Married to actor Christopher Backus, Mira has 4 children and has appeared on the 2016 Netflix series Lady Dynamite.