In your face! In a funny new video promoting healthy eating for her Let's Move campaign, First Lady Michelle Obama videobombs Miami Heat players -- and dunks on LeBron James.

President Barack Obama's wife, who celebrated her 50th birthday on Jan. 17, is seen sneaking behind athletes Dwyane Wade and Ray Allen while they chat with coach Erik Spoelstra at the White House about how eating healthy can help you perform like a champion.

In the video, Michelle is seen munching on an apple with Chris Bosh. She later runs behind the NBA players and dunks on a tiny basketball hoop, held by James. "In your face," the athlete yelled.

At the end, the First Lady sits down with the guys to relax while enjoying another apple. "Pretty good, huh?" she asked.

Watch the funny video now!