kelly osbourne Matthew Mosshart LAX sunglasses fiancee fashion police

Kelly Osbourne and fiance Matthew Mossheart landed at LAX on Saturday night, and the purple-haired starlet looked positively exhausted. Perhaps because she had been up all night on with her mom Sharon?

Yesterday Kelly tweeted, "My mum & I just worked a 24 hour day I'm so tired I feel like sh*t but it was so fun I feel like a d*ck for complaining!" The previous day she wrote, "My mum & I have been working on a project together for over 10 years today is the day it is finally happening! Cant wait 4 you guys to see!!"

Wonder what this secret project is?!