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Looks like supermodel Heidi Klum got a 3-for-1 deal with Martin Kirsten ... boyfriend, bodyguard and workout buddy.

The mother of four, who left the gym with her main squeeze, hit up a Brentwood Starbucks to fuel up on some coffee. Nothing like a little caffeine buzz between lovers!

Talk show host diva Wendy Williams recently blasted the model for dating her longtime bodyguard ... and added that Seal deserves "half her fortune." Perhaps Heidi and Martin were working out some frustration after hearing Wendy's rant.

Regardless, Heidi's figure looked fabulous at the MTV Europe Music Awards, so we know her workout routine has been doing her body good. We have a feeling Martin's reaping the benefits.

No wonder both of them are smiling!