According to FemaleFirst, Miller, who started dating Ifans last August, is currently planning a summer wedding, after the actor proposed to her for the third time.
A source revealed, "Rhys has admitted he and Sienna are getting married. Everything is supposed to be a secret, but Rhys is finding it hard to keep quiet. He can’t believe she finally said yes.
The couple would like the wedding to be before Ifans launches his musical career with his new group, The Peth. Among the expected guests will be Kate Moss, Keira Knightley and her boyfriend Rupert Friend, Sadie Frost, Noel Gallagher of the group Oasis, as well as Miller’s former boyfriend, Jude Law.