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Alexander Skarsgard had to stop a gaggle of overeager female fans from following him into the bathroom.

We’re told that the “True Blood” hunk was dining with family at Upper East Side bistro Le Bilboquet on Monday and excused himself to use the restroom.

But when the smitten ladies — iPhone video cameras rolling — followed him to the men’s room door, the “Big Little Lies” actor playfully wagged a finger at them and politely reminded them that they could not come inside.

“It was very funny,” said a source.

A rep for Skarsgard didn’t get back to us.