The friendly exes hung out on the patio to enjoy some food and drinks in the sun.
The 27-year-old actress brought her backpack with her, probably for a sleepover!
Kristen just made her directorial debut at Cannes Film Festival.
Stella and Kristen met on the set of one of the actress' films and have been linked to each other ever since.
Do you think Kristen and Alicia are going to get back together? Let us know what you think in the comments below.