John Stamos & Girlfriend Caitlin McHugh Pack on the PDA!

John Stamos plants a big kiss on his girlfriend Caitlin McHugh on Wednesday (July 20) in West Hollywood, Calif.

The pair looked so happy together as they walked hand-in-hand down the street while doing some shopping.

PHOTOS: Check out the latest pics of John Stamos

“They have a lot in common. Caitlin plays music and John loves music,” a source told People about their relationship. “She is a really sweet person.”

10+ pictures inside of John Stamos and his girlfriend Caitlin McHugh packing on the PDA during their day out…