(Cover) - EN Showbiz - Julia Roberts has been knitting pieces for Jennifer Aniston "for years".

The Hollywood star loves creating unique fashion pieces out of wool.

Her knitting needles help her calm down after a hectic day of movie shooting, and she enjoys treating her friends to pieces she's made.

"Julia's been knitting hats, scarves and mittens for her Friends friend for years!" a source told Mike Walker in National Enquirer.

"She loves to knit and Jen just loves her creations."

Jennifer has even been known to wear the pieces to official functions.

She often has people comment about how pretty they are, and enjoys shocking them by revealing where she got them from.

"She's got more than a dozen hats, and some of Julia's designs have even made it onto the red carpet. Whenever Jen's asked where she got her wool wear, she says they're original designs by Julia Roberts and everyone's always astounded." (C) Cover Media