SPOILERS
Robert Pattinson has revealed that Kristen Stewart looks like an 'alien' in The Twilight Saga: Breaking Dawn - Part 1.
The actors are set to reprise their roles of Edward Cullen and Bella Swan in the first part of the final instalment of the franchise.
And Pattinson admits that Stewart goes under quite a transformation in the first part as she struggles to get through her pregnancy.
Speaking to Premier magazine the actor said: "There are scenes where Bella looks like an alien. When the baby eats her from inside, she looks so thin and ghastly.
"Kristen had to wear this horrible make-up and when I'd see her come on set, I'd ask the crew, 'Are you sure we're filming Twilight? Isn't it supposed to be harmless and PG-13?'"
Breaking Dawn is the final book in the Twilight Saga series and has been split into two movies over the next two years.
Away from the franchise Pattinson has already enjoyed success this year with Water For Elephants and he has also finished work on Bel Ami and Cosmopolis.
The Twilight Saga: breaking Dawn - Part 1 is released 18th November.
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