Billy Ray Cyrus -- I'm on Patrick Schwarzenegger's Side

Billy Ray Cyrus has NO PROBLEM with his daughter's boyfriend getting chummy with chicks in Cabo.

Miley's dad was out in L.A., when a photog asked about Patrick's now famous Spring break, and Billy Ray made it clear ... he's team Patrick all the way.

The other way to interpret the video -- and accurately we might add -- is that Billy Ray's stamp of approval is proof Miley has forgiven her BF and all is well.