Blake Shelton Happy Birthday!!! Bye, Bye 30's

6/19/2016 7:06 AM PDT

Blake Shelton, Happy Birthday ... Bye, Bye 30's (PHOTO)

Blake Shelton turned the big 4-0 Saturday, so he and Gwen Stefani went old school by celebrating at an old-line L.A. restaurant.

Blake and Gwen celebrated Friday night at Dan Tana's in WeHo ... a delicious Italian restaurant that's been around for half a century.

Fun Fact:  It's the same place Phil Spector went for a few drinks the night that whole thing happened.