Chris Pratt & Katherine Schwarzenegger Look So Smitten on Date Night

Chris Pratt's the kinda G little homies wanna be like ... with a smoking' hot GF like Katherine Schwarzenegger, who's not afraid to get a little gangsta.

Chris and Katherine were out for date night Wednesday and hit up R+D Kitchen in Santa Monica. The couple rolled up on the restaurant in their casual best -- gym shorts, v-neck tee and ball cap for Chris ... and "spiritual gangsta" long sleeve tee for Kat.

They're clearly still in the puppy love stage ... sporting huge grins as they walked out after dinner. Last time we saw the love birds, they were riding ... Birds. Looks like they kept it on foot this time around.