Sienna
Miller
will
replace
Lindsay
Lohan
in
a
steamy
film
threesome
with
Keira
Knightley.
The
British
actress
will
take
Lindsay's
role
as
Caitlin
-
the
wife
of
Welsh
poet
Dylan
Thomas
-
in
new
movie
The
Best
Time
Of
Our
Lives,
written
by
Keira's
mother
Sharman
Macdonald.
Lindsay
reportedly
pulled
out
of
the
project
when
she
was
unable
to
reach
an
agreement
with
the
film's
financiers.
Keira
is
set
to
play
Vera
-
a
childhood
friend
of
Dylan's
who
is
said
to
have
had
a
sexual
relationship
with
him
and
Caitlin.
Matthew
Rhys,
who
will
play
the
hard-drinking
poet,
said:
"There
will
be
a
bit
of
a
menage
a
trois
scene
going
on.
I
hope
I'm
up
for
it!" Speculation
that
Lindsay
had
dropped
out
of
the
movie
surfaced
last
week,
when
the
actress
failed
to
appear
on
set
to
start
shooting.
Filming
is
set
to
resume
with
Sienna
in
Wales
early
next
month.