Emma Watson is still in touch with her 'Harry Potter' co-stars via a WhatsApp group

LOS ANGELES: Actress Emma Watson says she used to mess up lines during the filming of ' Harry Potter' movies.

The 26-year-old actress, who starred as Hermione Granger in the popular fantasy film franchise, says she felt guilty for making others redo parts of the movie.

"You will laugh but this is actually quite traumatic for me because I created issues because of this. I would ruin takes! First, the director's would be like, 'Cut! Emma, you're doing it again. You're mouthing Dan's lines.' And I'd be like, 'Ooh! I'm so sorry! So sorry! Oh, I feel bad!'" Watson said during an appearance at " Jimmy Kimmel Live".

Meanwhile, the 26-year-old star has revealed that the 'Harry Potter' cast keeps in touch via a "WhatsApp chat".