Malia Obama tried to pretend she's just another teenager raging out at Lollapalooza in Chicago -- but her not-so-Secret Servicemen were a dead giveaway.
The 16-year-old was sans Prez Obama or the First Lady ... hanging only with friends -- unlike the Beyonce-Jay Z concert where Michelle Obama chaperoned her.
The pics are pretty funny -- cause the muscle-bound guy in the black Polo shirt definitely does NOT fit in with the rest of the crowd around Malia. Still, he kept her mud-free ... which is more than a lot of the other fans can say.
Now if he could just keep people from taking her photo too.