Julia Roberts rarely shares personal photos with her fans – but she made an exception on Sunday as she took to Instagram with a loving tribute.MORE: Julia Roberts and Danny Moder's twins look so different in sweet family photosThe Hollywood actress delighted her Instagram followers with a rare selfie showing her with her "twin". WATCH: Julia Roberts' love story with husband Danny ModerThe candid snapshot shows Julia beaming for the camera as she poses next to acclaimed red carpet stylist Elizabeth Stewart.READ: Julia Roberts admires new 21-carat ring after rare comment about marriageMORE: Julia Roberts stuns fans with very intimate photo with husband Danny ModerIn the caption, Julia sweetly wrote: "Happy Birthday to this truly incredible person!! @elizabethstewart1 you are kind, creative, inexhaustible and my favorite twin!"A post shared by Julia Roberts (@juliaroberts)Julia shared a sweet selfie alongside her 'twin', ElizabethIn response, Elizabeth affectionately wrote: “Awwww love you twinnie!” along with a red love heart.Among those to like the post was Julia’s husband, Danny Moder.