Aly Raisman

Olympic Gymnast, Gold Medalist, Captain of the "Fierce Five" & the "Final Five"

Debra Messing

Emmy Award-Winning Actress & Global Ambassador for PSI/Youth AIDS

Rob Schneider

Emmy-nominated Actor, Comedian & Screenwriter; Former SNL Cast Member

Paul Reiser

Actor, Writer & Stand-Up Comedian Known for Portraying Paul Buchman in "Mad About You"

Jeffrey Tambor

Emmy Award-Winning Actor of "Arrested Development," "The Hangover" & "Transparent"

Mayim Bialik

Neuroscientist, Mental Health Advocate & Actress Known for "The Big Bang Theory"

Chelsea Handler

Comedian, TV Personality & Author

Sarah Michelle Gellar

Television & Film Actress, Co-Founder of Foodstirs

Jason Alexander

Actor, Writer & Director; Best Known for His Work on "Seinfeld"

Rashida Jones

Actor, Writer and Producer; Best Known for Roles in "The Office" & "Parks and Recreation"

Bill Maher

Political Satirist & Host of HBO's "Real Time"

Natalie Portman

Award-Winning Actress Known for "Black Swan," "V for Vendetta" & Playing Padmé Amidala in the Star Wars Prequel Trilogy

Natalie Portman on self-confidence and performing from an early ...

Tracee Ellis Ross

Actress, Producer; Chief Executive Officer at PATTERN