'Friends' baby Emma is all grown up!

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20 PHOTOS
Friends Cast - 20th anniversary
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'Friends' baby Emma is all grown up!
FRIENDS -- Season 6 -- Pictured: (l-r) David Schwimmer as Ross Geller, Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller, Matthew Perry as Chandler Bing, Lisa Kudrow as Phoebe Buffay, Matt LeBlanc as Joey Tribbiani -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- Season 10 -- Pictured: Courteney Cox as Monica Geller, Matt LeBlanc as Joey Tribbiani, Lisa Kudrow as Phoebe Buffay, Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green, David Schwimmer as Dr. Ross Geller (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS - 'The One With The Engagement Picture' -- Episode 5 -- Aired 11/2/2000 -- Pictured (l-r): Lisa Kudrow as Phoebe Buffay, Jennifer Aniston as Rachel Green, Matthew Perry as Chandler Bing -- NBCU Photo Bank
This photo released by Warner Bros shows the cast of "Friends" from the final episode which wil air May 6, 2004 on NBC. It was taken in Burbank, Calif, Friday, Jan. 23, 2004. From left are Jennifer Aniston as Rachel, Matt LeBlanc as Joey, David Schwimmer as Ross, Lisa Kudrow as Phoebe, Matthew Perry as Chandler and Courteney Cox Arquette as Monica. (AP Photo/Danny Feld, Warner Bros)
The cast of television's "Friends", from left: Matt LeBlanc, Matthew Perry, Lisa Kudrow, Courteney Cox Arquette, Jennifer Aniston and David Schwimmer appear during the 54th Annual Primetime Emmy Awards Sunday, Sept. 22, 2002, at the Shrine Auditorium in Los Angeles. (AP Photo/Kevork Djansezian)
The cast members of the television show "Friends" arrive at New York's Rockefeller Center for NBC's 75th Anniversary event Sunday May 5, 2002. From left: Matthew Perry, Courteney Cox Arquettte, David Schwimmer, Jennifer Aniston and Matt LeBlanc. (AP Photo/Tina Fineberg)
FRIENDS -- Season 6 -- Pictured: (l-r) David Schwimmer as Ross Geller, Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller, Matthew Perry as Chandler Bing, Lisa Kudrow as Phoebe Buffay, Matt LeBlanc as Joey Tribbiani -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One with the Fake Monica' Episode 21 -- Pictured: (l-r) Lisa Kudrow as Phoebe Buffay, Matt LeBlanc as Joey Tribbiani, Jennifer Aniston as Rachel Green, David Schwimmer as Ross Geller, Matthew Perry as Chandler Bing, Courteney Cox Arquette as Monica Geller (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- Pictured: (l-r) Jennifer Aniston as Rachel Green, David Schwimmer as Ross Geller, Matthew Perry as Chandler Bing, Lisa Kudrow as Phoebe Buffay, Courteney Cox Arquette as Monica Geller, Matt LeBlanc as Joey Tribbiani (Photo by Andrew Eccles/NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One After 'I Do' -- Episode 1 -- Aired 09/27/2001 -- Pictured: (l-r) Lisa Kudrow as Phoebe Buffay, Courteney Cox as Monica Geller-Bing, Jennifer Aniston as Rachel Green-- Photo by: Danny Feld/NBCU Photo Bank
FRIENDS -- 'The One With The Christmas In Tulsa' -- Episode 10 -- Aired 12/12/2002 -- Pictured: (l-r) Matt LeBlanc as Joey Tribbiani, Courteney Cox-Arquette as Monica Geller Bing, Lisa Kudrow Phoebe Buffay, David Schwimmer as Ross Geller, Jennifer Aniston as Rachel Green -- Photo by: NBCU Photo Bank
FRIENDS -- 'The One Where the Stripper Cries' -- Episode 11 -- Aired 2/5/2004 -- Pictured: (l-r) Courteney Cox Arquette as Monica, Jennifer Aniston as Rachel, Matthew Perry as Chandler -- Photo by: NBCU Photo Bank
FRIENDS -- 'The One With The Boob Job' -- Epsiode 16 -- Aired 2/20/2003 -- Pictured: (l-r) Matt LeBlanc as Joey Tribbiani, Jennifer Aniston as Rachel Green, Courteney Cox-Arquette as Monica Geller Bing, Matthew Perry as Chandler Bing -- Warner Bros. Photo
FRIENDS -- 'The One With Monica And Chandler's Wedding' -- Episode 24 -- Aired 5/17/2001 -- Pictured: (l-r) Lisa Kudrow as Phoebe Buffay, Courteney Cox as Monica Geller-Bing, Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green -- Photo by: Danny Feld/NBCU Photo Bank
FRIENDS -- 'The One With The Embryos' -- Episode 12 -- Aired 1/15/1998 -- Pictured: (l-r) Matt Le Blanc as Joey Tribbiani, Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- Season 2 -- Pictured: (l-r) Matthew Perry as Chandler Bing, Jennifer Aniston as Rachel Green, David Schwimmer as Ross Geller, Courteney Cox as Monica Geller, Matt LeBlanc as Joey Tribbiani, Lisa Kudrow as Phoebe Buffay (Photo by NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One with the Embryos' Episode 12 -- Pictured: (l-r) Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller, Matthew Perry as Chandler Bing (Photo by J. Delvalle/NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One That Could Have Been: Part 1, 2' Episode 15, 16 -- Pictured: (l-r) Courteney Cox as Monica Geller, Matt LeBlanc as Joey Tribbiani, Jennifer Aniston as Rachel Green (Photo by Chris Haston/NBC/NBCU Photo Bank via Getty Images)
FRIENDS -- 'The One with the Embryos' Episode 12 -- Pictured: (l-r) Matthew Perry as Chandler Bing, Matt LeBlanc as Joey Tribbiani, Courteney Cox as Monica Geller, David Schwimmer as Ross Geller, Debra Jo Rupp as Alice Knight Buffay, Jennifer Aniston as Rachel Green, Giovanni Ribisi as Frank Buffay Jr., Lisa Kudrow as Phoebe Buffay (Photo by J. Delvalle/NBC/NBCU Photo Bank via Getty Images)
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Noelle and Cali Sheldon were part of one of TV's biggest sitcoms, but they were too young to know it at the time.

The twins played baby Emma, the daughter of Friends couple Rachel (Jennifer Aniston) and Ross (David Schwimmer), in the show's final two seasons.

NEWS: Is the Cast of 'Friends' Still Friends?

"I grew up knowing that I was on Friends, but I didn't realize the extent of it until I was probably 10," Noelle tells ET.

Stars you didn't know auditioned for Friends:

11 PHOTOS
Actors you didn't know auditioned for 'Friends'
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'Friends' baby Emma is all grown up!
FRIENDS -- Season 6 -- Pictured: (l-r) David Schwimmer as Ross Geller, Jennifer Aniston as Rachel Green, Courteney Cox as Monica Geller, Matthew Perry as Chandler Bing, Lisa Kudrow as Phoebe Buffay, Matt LeBlanc as Joey Tribbiani -- (Photo by: NBC/NBCU Photo Bank via Getty Images)
Ellen DeGeneres turned down the role of Phoebe.
Tea Leoni was the first choice for Rachel, but turned it down.
Elizabeth Berkley auditioned for Rachel, too.
Eric McCormack auditioned for the role of Ross a few times.
Jon Favreau was offered the role of Chandler, but turned it down.
Jon Cryer almost auditioned for Chandler, but his audition tape got to executives too late.
Hank Azaria auditioned for Joey several times.
Lisa Kudrow beat out Kathy Griffin for the role of Phoebe.
Kudrow also beat out Jane Lynch.
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Despite their time starring alongside Aniston, the twins, now 12 years old, are normal seventh graders. They attend public school, play sports and instruments and do charity work, while still pursuing acting on the side. Both have had roles in short films and appeared in the 2007 pilot for the NBC drama Life.

"I want to keep being an actress because I think it's really fun to be a different person for a little bit," Cali tells ET. "But it's more of a hobby than a career path."

VIDEO: 'Friends' Cast Reprise Roles on 'Kimmel'

Cali and Noelle got the Friends job after their mom read on a twin parenting blog that many film and TV productions seek out twins for acting jobs due to the time restraints on young actors. They don't remember their time on the show, but their parents tell them that all the stars of the hit NBC sitcom were "really nice."

"Our friends think it's really cool because they think we're famous," Noelle says. "I particularly don't think we're famous or anything because we were babies so, people aren't going to say, 'Oh you're baby Emma from Friends.' But they think it's really cool because they think we're famous."

While they've seen clips of themselves on Friends, the twins aren't allowed to watch the show until they're older.

"My mom said that we can watch them when we're 13," Noelle says. "So probably a few days after I turn 13, I'm just going to go on Netflix. Twenty four-hour Friends marathon."

LIST: The Definitive Guide to Binge-Watching 'Friends' on Netflix!

Check out ET's guide to binge-watching Friends on Netflix in the video below.

The Definitive Guide to Binge-Watching 'Friends' on Netflix!

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