From First Lady to first aid!

Sources tell Page Six that the Michelle Obama sprang into action at a Martha’s Vineyard tennis club recently when a fellow player took a bad tumble and tore his hamstring.

We hear two men — including NYC restauranteur and hospitality whiz David Rabin — were playing on a Martha’s Vineyard court next to Obama, who had security posted around the outside corners of the area.

“The other guy goes to chase a lob over his head,” a spy told Page Six of the incident. “It’s like he’s showing off for Michelle Obama and he trips! He’s lying on the ground… and she’s looking, and David Rabin is looking, and then they both realized he was actually hurt.”

That’s when the Harvard Law School grad jumped into action, we hear.

“Obama looks at her security guys, like, ‘Go loo

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