Best of CelebriGum

CeeLo Green

Julianne Moore

 Tom Cruise

 Kelly Ripa

Governor Rick Perry

 Paris Hilton

 George Clooney

Unspecified Kardashian

 Bill Murray kicking a field goal, with Dave Letterman holding

 Justin Bieber

 Jessica Chastain

Baltimore Ravens head coach John Harbaugh, Elvis tribute artist Shawn Klush

Marg Helgenberger

Justin Bieber, again

 Anna Faris

Julia Roberts

Do you have other favorites?  Let me know, and maybe I'll add them (after a thorough vetting by the International Gum Superlatives Council based in The Hague).