Britney's Really, Really, Really Bad Timing

So Britney Spears and K-Fed's lawyer walk into a bar ... no, it's not the beginning of a joke.

Our spies were there when Uber-lawyer Mark Vincent Kaplan was at the bar at the Four Seasons Hotel in Bev Hills at around 6:30 last night, when guess who walked in -- Britney, Alli Sims and Brit's manager, Sam Lufti. Imagine her shock when she came face-to-face with the man who engineered the custody miracle for K-Fed -- in a bar!!

As the stunned trio faced Kaplan, the barrister said, "Nothing to worry about. I'm not on duty." With that, Brit and Co. walked out. BTW, she wasn't drinking.

One more thing -- there's a hot rumor that K-Fed is doing "Oprah" -- mind out of gutter please -- her show. It's not true.