Sophia Bush

Actress, Humanitarian & Author

Ed Begley Jr.

Environmental Activist & Emmy Award-Nominated Actor

Ian Somerhalder

Actor Known for "The Vampire Diaries"; Animal & Environmental Advocate; Founder of The Ian Somerhalder Foundation

Jenna Marbles

YouTube Sensation

Ellen DeGeneres

Award-Winning Comedian, TV Host, Actress & LGBTQ Activist

Melissa Rivers

Actress, Television Host & Producer, Equestrienne, and Philanthropist; Daughter of Late Comedian Joan Rivers

Tim Gunn

Fashion Icon, Former Co-Host & Mentor of "Project Runway"

Cesar Millan

Host of The Dog Whisperer; Author of Cesar's Way

Lo Bosworth

Entrepreneur & Lifestyle Personality, Author, and Alum of MTV’s Reality Show, "The Hills"

Jillian Michaels

Leading Fitness Expert, Certified Nutritionist, Renowned Life Coach & Powerful Entrepreneur

Tamron Hall

Award-Winning Journalist; Former National News Anchor for NBC News; Host of the "Tamron Hall Show"

Watch Where They Hide

Alyssa Milano

Actress, Author, Philanthropist & Founder of Touch by Alyssa Milano; Known for "Charmed" and "Who's the Boss"

Daryl Hannah

Actress, Best Known for "Kill Bill" & "Splash"; Environmental Activist

Bill Maher

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

Hilary Swank

Academy Award-Winning Actress; Best known for her roles in 'Million Dollar Baby' and 'Boys Don't Cry'

Kristin Cavallari

TV Personality, Fashion Designer, Bestselling Author & Founder of the Lifestyle Brand Uncommon James

True Comfort: More Than 100 Cozy Recipes Free of Gluten and Refined Sugar: A Gluten Fre...

Eric Stonestreet

Actor & Comedian, Best-Known for "Modern Family"

Joanna Krupa

Polish-American Model; Known for Bravo's Hit Reality Series "The Real Housewives of Miami"

Charlize Theron

Academy Award-Winning Actress; Best Known for "Monster" & "Mad Max: Fury Road"

Kevin Nealon

Former Cast Member of 'Saturday Night Live'; Co-Star on Showtime's "Weeds"