Nike bigwigs are pulling out all stops to persuade Kristen Stewart — a huge fan of the shoemaker — to sign a celebrity endorsement deal, Breaking Celebrity News has been told.

"It's no secret how much Kristen loves Nikes," a source dished. "She often changes into a pair of Nikes after walking the red carpet in heels."

But Nike is facing an uphill battle as the Twilight star, 23, who is notoriously private, shudders at the thought of having her face on advertisements!