One of the world's best athletes, LA Galaxy star David Beckham, is as fit and trim as they come. He's got killer abs and speedy, sexy legs that have taken his soccer teams to playoff after playoff ... so you probably wouldn't suspect Beckham is a fast food fiend!

Okay, so maybe he's not a fiend ... we usually catch the soccer stud at Jamba Juice getting his fill of icy, berry blends or at Yogurtland picking up some creamy froyo for his kids but David loves his burgers too, apparently!

We caught Mr. Beckham at In-And-Out Burger Saturday, as he picked up a quick snack. And hey, a burger and fries every once in a while certainly won't even make a DENT in this guy's fab physique. He's got energy to burn and her burns it, baby!