Kevin Federline I Got a Good Heart

1/24/2012 3:00 AM PST

Kevin Federline was unfazed by his heart scare Monday.  A photog got K-Fed at a doctor's office in Sydney, Australia, and Brit's ex said he's just fine, even though he's blowing off the notion that smoking may have contributed ... pizza may have contributed as well.

K-Fed says he'll continue shooting his reality show, "Excess Baggage."