Trying her best to go incognito, Sandra Bullock dropped her son Louis off at school in Los Angeles on Wednesday (January 23).

The "Blind Side" star covered up in a black fleece, baseball cap and shades as she gave a little smile to the awaiting shutterbugs.

Earlier in the day, an international trailer for the 48-year-old actress's upcoming movie, "The Heat" was released.

Costarring Melissa McCarthy, the buddy cop comedy follows a straight-laced FBI Agent and a foul-mouthed Boston police officer as they try to bring down a ruthless drug lord. Check out the trailer below.