London
(ANI):
Popstar
Robbie
Williams
has
agreed
to
make
an
appearance
on
The
X
Factor.
The
former
Take
That
star's
website
confirmed
that
the
35-year-old
will
feature
on
the
ITV1
show's
sixth
series,
which
kicks
off
on
August
22,
reports
the
Sun.
It
read:
"We're
very
excited
to
tell
you
that
this
is
true!
Details
are
still
being
finalised
so
make
sure
you
stay
tuned
for
further
announcements."
Madonna,
Rihanna,
Whitney
Houston
and
Lily
Allen
are
other
singers
being
lined
up
to
take
part.