K-Fed Hits Brit's Place

Kevin Federline made a visit to Britney on her birthday weekend.

TMZ spotted K-Fed Sunday morning as he was leaving the Malibu Colony area where Spears and the kids are currently staying. We're not sure if Federline spent the night, and he wasn't talkin' when cameras rolled during his stop at a nearby gas station.

When asked if the kids looked good, Federline responded, "Always man." Even sweeter, one photog asked if Kevin was currently on tour. His response -- "Take it easy."