-Disclaimer: these 'dream' cast lists are based more on looks and typecasting that actual dance/vocal ability ;) -

Don: Clint Eastwood
Maggie: Olivia Newton John
Mike: Sylvester Stallone
Connie:Diana Ross
Greg: David Bowie
Cassie: Barbara Streisand
Sheila: Ann Margaret
Bobby: Steve Martin
Bebe: Carol Burnett
Judy: Cher
Richie: Stevie Wonder
Al: Steve Lawrence
Kristine: Eydie Gormé
Val: Bette Midler
Mark: Shaun Cassidy
Paul: Woody Allen
Diana: Liza Minelli
Compiled by the Broadway Cast of ACL (Taken from 'The Longest Line')

Diana: Jennifer Lopez
Paul: Skeet Ulrich
Mark: Joshua Jackson
Val: Alicia Silverstone
Richie: Will Smith
Judy: Calista Flockhart
Al: Matt Le Blanc
Kristine: Gwynneth Paltrow
Bebe: Drew Barrymore
Sheila:
Bobby: Kevin Spacey
Greg: Richard E. Grant
Connie: Ming-Na
Mike: Noah Wyle
Maggie: Cameron Diaz
Don:Brad Pitt
Cassie:Kate Winslet
Zach: David Duchovony
Submitted by Rowena

Diana: Jennifer Lopez
Paul: Ricky Martin
Mark: Nicholas Brendan
Val: Britney Spears
Richie: Will Smith
Judy: Alyssa Milano
Al: John Stamos
Kristine: Rebecca Stamos
Bebe: Drew Barrymore
Maggie: Andrea McArdle
Cassie: Annie from Caroline in the City
Submitted by Anonymous

Diana: Jennifer Lopez
Paul: Patrick Rafter
Mark: Mark Vanderloo
Val: Bette Midler
Richie: Cooba Gooding Jr
Judy: Sandra Bullock
Al: Tom Cruise
Kristine: Gwyneth Paltrow
Bebe: Drew Barrymore
Sheila: Christina Aguilera
Bobby: Rob Lowe
Greg: York (Vengaboys, the sailor)
Connie: Lucy Liu
Mike: Ricky Martin
Maggie: Andrea Corr
Don: Brad Pitt
Cassie: Laura Leighton (Melrose Place)
Zach: Michael Douglas
Larry: Matt Dillon
Submitted by Joris Van Der Ring

Diana: Jennifer Lopez
Paul:John Leguizomo
Mark: Freddie Prinze Jr.
Val: Kristen Chenoweth
Richie: Will Smith
Judy: Calista Flockhart
Al: Jon Stamos
Kristine: Alcia Silverstone
Bebe: Drew Barrymore
Sheila: Burnadette Peters
Bobby: Matthew Perry
Greg: Malcom Gets or Alan Cumming
Connie:
Mike: Matt La Blanc
Maggie: Lea Tompson
Don: George Clooney
Cassie: Grace (of Will and Grace)
Zach: Mady Patinkin
Larry: Alan Cumming
Submitted by Anonymous

Don: Brian of the Backstreet Boys
Maggie: Christina Aquilera
Mike: J.C. Chasez of N*Sync
Connie: Lucy Liu
Cassie: Jennifer Gambatese
Sheila: Madonna
Bebe: Amy Jo Johnson
Judy: Calista Flockhart
Kristine: Britney Spears
Val: Jane Krakowski
Mark: Nick of the Backstreet Boys
Diana: Jennifer Lopez
Submitted by Anonymous

Bobby: The guy that lived in Carrie 2
Cassie: Glenn Close
Connie: Lucy Liu
Dianna: Jennifer Lopez
Don: Me
Greg: Ryan Phillippe
Judy: Heather Locklear
Al: Tom Cruise
Kristine: Nicole Kidman
Larry: One of the Brady Bunch kids
Laura: Tempest Bledsoe
Maggie: Alyssa Milano
Mark: Jonathan Taylor Thomas
Mike: Matthew Perry
Paul: Enrique Eglacious
Richie: Usher
Sheila: Madonna
Val: Sarah Michelle Gellar
I would also change the ending so Sheila would have made it instead of Cassie.
Submitted by Anonymous

DON - Rob Lowe
MAGGIE - Brandy
MIKE - Paul Rudd
CONNIE - Ming-Na (ER)
GREG - French Stewart
CASSIE - Joely Fisher
SHEILA - Kyra Sedgewick
BOBBY - Matthew Perry (Friends)
BEBE - Sarah Jessica Parker
JUDY - Jenna Elfman
RICHIE - Omar Epps
AL - John Stamos
KRISTINE - Christine Taylor
VAL - Rose McGowen
MARK - Brekin Meyer (
PAUL - John Leguizamo (Summer of Sam)
DIANA - Jennifer Lopez
ZACH - Kevin Kline
LARRY - Jason London
Submitted by Mikey

Diana- Salma Hayeck
Paul- Scott Foley
Christine- Amy Smart
Connie- Lucy Lui
Sheila- Sharon Stone
Judy- Gwyneth Paltrow
Marc- Matt Damon
Bebe- Drew Barrymore or Keri Russell
Zach- Kevin Spacey
Cassie- Madonna
Al- Ben Afleck
Bobby- Alan Cummings or Ed Norton
Maggie- Claire Danes
Larry- Terrence Mann Richie- Cuba Gooding Jr.
Submitted by Anonymous

To submit your own all-star cast list, click here.