Chloe Grace Moretz has sprained her knee.

The 17-year-old actress, who is rumoured to be dating Brooklyn Beckham, is currently sporting a big black brace on her right leg after injuring herself while performing a stunt on the set of her upcoming movie, 'The Fifth Wave,' in Atlanta.

A spokesperson for the blonde beauty, who was photographed using crutches as she made her way through Los Angeles International Airport (LAX) on Wednesday (17.12.14), told E! News it is only a ''slight sprain,'' adding: ''She does all of her own stunts.''

Chloe also assured her fans on Twitter that she is doing well after they expressed concern about her injury.

After one fan tweeted: ''@ChloeGMoretz getwellsoon chloe,i hope you feeling better now,'' she responded: ''thank you so much it's just a light sprain and I'm being extra careful.''

Despite striving to do most of her own stunts, Chloe recently insisted she is ''a bit of a geek in real life'' and doesn't take risks.

She said: ''I'm a bit of a geek in real life, but I'm very driven when it comes to my work.

''I'm not the kind of person who's going to do anything crazy and my mom makes sure I stay grounded.''