Ashton Kutcher and Mila Kunis -- The Weekend Getaway

Do "friends" take weekend trips to the beach ... go shopping for flowers ... and hit Starbucks together? 'Cause that's what Ashton Kutcher and Mila Kunis were up to this weekend.

The former "70s Show" costars were spotted in Carpinteria, CA together -- a small beach community near Santa Barbara.

The two were seen picking up coffee and later buying sunflowers ... out of a van.