I was reading the post like this one lower on the page and decided to do a little research of my own. This is what I came up with...
Lindsay Morgan Lohan
Sisters: Hilary Ann Duff and Hayley Katherine Duff
Stephen Glenn Martin (Steve)
Bonnie Lynn Hunt
Piper Lisa Perabo
Thomas John Patrick Welling
Alyson Michelle Stoner (dancer in Missy E videos)
Ryan Thomas Gosling
Laura Jean Reese Witherspoon
Adam Richard Sandler
Twins from Big Daddy: Cole Mitchell and Dylan Thomas Sprouse
John Christopher Depp II
Kate Elizabeth Winslet
Sisters: Britney Jean and Jamie Lynn Marie Spears
Justin Randall Timberlake
Colin James Farrell
For those American Pie lovers:
Thomas Ian Nicholas
Allison Lee Hannigan (goes by Alyson Hannigan)
Shannon Elizabeth Fadal (goes by Shannon Elizabeth)
Sean William Scott (goes by Seann Williams Scott)
Dennis William Quaid
Jacob Benjamin Gyllenhall
Emmanuelle Grey Rossum (goes by Emmy Rossum)
For the Friends lovers:
Courteney Bass Cox
Lisa Marie Diane Kudrow
Matthew Langford Perry
And for the OC lovers:
Benjamin Mackenzie Schenkkan (goes by Ben Mackenzie)
Mischa Anne Barton
Adam Jared Brody
Rachelle Jade Bilson (goes by Rachel Bilson)
American Idol Lovers (thats me!!!):
Ryan John Seacrest
Simon Phillip Cowell
Paula Julie Abdul
Kelly Brianne Clarkson
Justin Eldrin Bell Guarini
Christopher Ruben Studdard (Rubern Studdard)
Clayton Holmes Grissoni (Clay Aiken)
Diana Nicole DeGarmo
Jasmine Soriano Trias
John Bassat Stevens IV
John-Peter Lewis (goes by Jon Peter Lewis)
Ciara-Camile Roque Valesco (Camile Valesco) (has a sister, Tuesday)
Amy Christina Adams
Leah Vladowski (went by Leah LaBelle)
Willard Christopher Smith Jr. (Will Smith)
Albertina Marie Majorino (Tina Majorino)
Julia Fiona Roberts
Kirsten Caroline Dunst
Julia O'Hara Stiles
7th Heaven Lovers:
Michael Barrett Watson (Barry Watson)
David Lee Gallagher
Jessica Claire Biel
Beverley Anne Mitchell
Mackenzie Ryann Rosman
Twins who play Sam and David: Lorenzo Nathanel and Nikolas Landon... but are a set of quads. Have sister Myrinda and brother Zachary)
Brothers: Matthew William Lawrence, Joseph Lawrence Mignogna Jr., and Andrew James Lawrence
Anna Kay Faris