Fashion designer Ruby Rose claims that 'Twilight' star Kristen Stewart is a lesbian, tweeting that the actress is a homosexual.

"I'm sorry, but Kristen Stewart has to be a lesbian. I don't mean to stereotype but isn't it obvious," Rose wrote on Twitter, said news.com.au.

In the meantime, Stewart, who stars with Dakota Fanning in the upcoming film 'The Runaway', said that the experience of a lesbian love shot in the movie was not much of an excitement.

"It''s just something we did," she told E! Online.

"In this story, it''s so not like a romantic thing. It''s just something that they just do."

Stewart confessed that her role as Joan Jett in the movie was more than a challenge.

"We had so many other really crazy things that we were intimidated by, like, we had a performance that day, so when that came up on the schedule we were like, ''Whoa!''," she said.

"But then, ''Alright, whatever''. It was sort of just like another thing."