Actor Robert Pattinson will reunite with his girlfriend Kristen Stewart for the premiere of the final 'Twilight' movie.

The 26-year-old actor has told friends he does not want to "see or speak to" 22-year-old Kristen after her fling with married film director Rupert Sanders, 41.

But the 'Twilight' co-stars - who play couple Bella Swan and Edward Cullen in the film - have been told by producers they must attend the November premiere of 'Breaking Dawn Part 2'.

They are contractually obliged to be pictured side by side on the red carpet.

A source told The Sun newspaper: "RPatz is in pieces but the 'Twilight' love triangle storyline is nothing without him and Kristen. It is eating him up that he has no choice but to see her again because of work. His humiliation is total."

Robert moved out of the Los Angeles, California mansion he shared with Kristen after he discovered her affair with father-of-two Rupert.

The couple had been together for three years and both Kristen and Rupert -- who met on the set of 'Snow White and the Huntsman' -- have publicly apologised.