Luke Skywalker actor Mark Hamill may have let a little too much slip on his twitter account while discussing his beard on Monday (November 23rd). While his tweet may have seemed innocent enough, it has potentially revealed a major spoiler for the upcoming Star Wars: The Force Awakens movie.

Mark HamillLuke Skywalker actor Mark Hamill.

Hamill’s tweet seems to confirm that the actor will be back as Skywalker for Star Wars: Episode VIII, due out in May 2017. Many fans had theorised that Skywalker wouldn't survived the events of The Force Awakens, but Hamill’s comments suggest otherwise.

‘Last shaved on 10/22 after final day of my 2nd #TheFlash (which airs 12/8 #XmasTrix), just in time for Ep VIII-whew!’ the actor wrote. Hamill is contractually obliged to sport a beard for his Star Wars role, but appears in CW series ‘The Flash’ as The Trickster clean-shaven.

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Hamill’s character has so far not appeared in any promos for The Force Awakens leading to major speculation among fans. However despite Hamill’s tweets, some have theorised that the character could still die in The Force Awakens and could simply return as a “Force ghost” in the next instalment.

After his potential-spoiler tweet garnered so much attention, Hamill returned to Twitter later on Monday night writing: ‘Sorry to spoil your "spoilers", but the Press widely reported my return to Skellig w/ @rianjohnson for SW shoot. My lips remain sealed. #shh.’

Last week the 64-year-old had spoken to website PC Gamer about his ability to keep a secret. “I have something coming out where there’s an amount of money that if it leaks because of me I don’t get that payment. If I keep it a secret until the day it comes out, I get that payment,” Hamill said.

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The actor then went on to discuss how he managed to keep the news that Darth Vader was actually Luke’s father to himself for ages. “I’m proud of the fact that I knew a year and a half before anybody else that he [Darth Vader] was actually dad-Vader.”

“I didn’t even tell Harrison [Ford], or my wife, because I thought it would be terrible if she said ‘you know what’ to a fan and it got out,” Hamill added. You can watch the trailer for Star Wars: The Force Awakens below: