By Breaking Celebrity News Staff

Kristen Stewart continues to wear her heart on her sleeve  -- by wearing ex-boyfriend Robert Pattinson’s baseball cap on her head!

The Twilight star -- who scandalously cheated on R-Pattz with her ‘Snow White’ director Rupert Sanders -- was photographed Sunday at Toronto’s Pearson International Airport after attending the Toronto Film Festival, and Breaking Celebrity News has the pics.

As Breaking Celebrity News has previously reported, Stewart,22, was there to promote her new film On The Road, which features an all-star cast, including Terrance Howard, Amy Adams, Kirsten Dunst, and Elizabeth Moss.

The festival marked her first red carpet appearance since she was photographed kissing the married Sanders.

While Stewart was busy promoting her film