“I’ve known Robert for many, many years. Our friendship pre-dates the

She added, “I always love to be on set with him. You never know what he’s gonna do or say, and he really keeps you on your toes. You know, he’s a very special guy.”

RELATED: Scarlett Johansson and Colin Jost Show Off Their Love on

Paltrow portrays Pepper Potts in the 

“Happy Birthday @robertdowneyjr I love you to the moon and back. Love, your ?,” Paltrow wrote with the black and white selfie.

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