The second standalone "Star Wars" prequel following the recently released "Rogue One: A Star Wars Story", will see Ehrenreich playing young Han Solo.
"Two Han Solos grabbing lunch," a fan wrote on Twitter alongside a picture of the two actors chatting at a restaurant.
Other confirmed cast members include Donald Glover, who will play a young Lando Calrissian, and Emilia Clarke as Solo's love interest.
Phil Lord and Chris Miller are helming the project, while Kathleen Kennedy and Allison Shearmur are producing it.
The film, which is expected to begin production in January, is slated to hit the US theaters on May 25, 2018.