"I love April 4th because it was the day god gave us @robertdowneyjr HAPPY BIRTHDAY, dear heart. Love me and that other guy in the photo," Paltrow said in reference to Holland who is featured less prominently in the photo.
Paltrow has starred alongside Downey's Iron Man as love interest Pepper Potts throughout the Marvel cinematic universe and will be reprising her role in "Avengers: Infinity War," which is set to hit theaters on April 27.
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