The couple has been dating since 2016 and it seems that they are very happy with one another.
Stewart, 28, wore a black mini-skirt with sunglasses and black sneakers as the temperatures soared in LA.
She completed her look with an army green t-shirt revealing a hint of midriff, and she accessorized with a silver pendant necklace.
Her girlfriend also opted for a casual look as the pair merged unnoticed with people enjoying the warm weather.
RadarOnline.com recently revealed how Stewart had been flirting with Drew Barrymore.
We pay for juicy info! Do you have a story for RadarOnline.com? Email us at firstname.lastname@example.org, or call us at (866) ON-RADAR (667-2327) any time, day or night.