(Cover) - EN Showbiz - Kelly Osbourne has been having the worst day of her life on the set of her upcoming movie.

The 26-year-old reality television star found fame on reality series The Osbournes, which followed the antics of her and her famous family, but the star has since shown promise in the fields of acting and presenting.

Kelly is currently shooting her role in spy film So Undercover, which tells the tale of a tough private eye who is hired by the FBI to go undercover in a college sorority. However, things havent been going so well on set since Kelly came down with sickness and diarrhoea.

The star can laugh about the situation though, and has taken to social-networking site Twitter to express her exasperation.

Having to film a party scene while trying not to s**t ur tights and puke at the same time = worst day of my life (sic), wrote Kelly on her Twitter page.

Kelly has been battling on with shooting the movie, which also stars Miley Cyrus, Alexis Knapp and Cameron Deane Stewart despite her illness. The star was happy to say that her colleagues have been making sure she gets better.

Finally done for the day three bags of IV fluid later we all dropped like flys thanx so much to production team for looking after me so well!!! (sic), she wrote.

Before starting her tough day of shooting Kelly had revealed she wasnt the only one on set feeling peaky. The star says she doesnt plan to eat seafood for a while, suggesting she had suffered food poisoning.

I'm still actually really sick so are three other girls GOD please help us get through this day!!!!! (sic), pleaded the star.

I never want to eat shrimp again :( (sic). (C) Cover Media