The 23-year-old reunited with the "Hunger Games" star over the Christmas last year, spending time with him and his relatives in his native Australia.
Since then, reports have suggested the young couple are giving its relationship another go, after originally calling off an engagement in September, 2013.
Now, the pair has been photographed arriving in the same car for dinner with Liam's family in Los Angeles, reported Entertainment Tonight.
Miley wore sunglasses and her blonde hair pulled back in a bun for the casual outing, while Liam, 26, donned jeans, a white T-shirt and blue jacket.
The gang dined at organic Mexican restaurant Gracias Madre in West Hollywood and appeared in good spirits as they left the venue.
Miley and Liam are reportedly living together again, and the singer has even been reportedly wearing the engagement ring which the actor originally gave her in June, 2012.