Youngest
Billionaire
 
Kylie Jenner
has
become
 
the
youngest
 
self-made
billionaire
ever,
at
 
the
age
 
of
21.
The reality
TV
star
overtook
Facebook
tycoon
 
Mark Zuckerberg
 
to
top
 
Forbes'
annual
billionaires
list.
Her
new-found
title
 
is
 
because
 
of
her
Kylie Cosmetics
empire,
 
 
which
was
founded
in
2015
 
and
 
is
 
now
estimated
 
to
 
be
worth
 
a
staggering
 
$900
million.