This character has many names.
It is called horns, horns devil, goat horns, devil’s mark.
In countries with Mediterranean he has a pretty vulgar meaning.
Of course, that the stars in these photos do not mean anything vulgar, and show the horns for a reason.

Ronnie James Dio

Drew Barrymore, Rob Halford

Sharon Osbourne (center) with her children Jack and Kelly Osbourne Osbourne, as well as Jack Black and Kyle Gass

Hayley Williams

Kid Rock

Miley Cyrus

Kate Walsh

Nick Carter (Backstreet Boys)

Winona Ryder

Justin Bieber

Jada Pinkett Smith

Sebastian Bach

Avril Lavigne

Jamie Foxx

Katherine Heigl

Bret Michels

Mos Def

Fergie

Jennifer Love Hewitt

Audrina Patridge

Bam Margera

Jack Black and Leighton Meester