Pepper Potts has been part of the MCU since its inception in 2008 with Iron Man, and she returned for 2010’s Iron Man 2, 2012’s The Avengers and 2013’s Iron Man 3.
However, Paltrow reprised Pepper for a surprise cameo towards the end of Spider-Man: Homecoming earlier this summer, which saw Tony finally planning to propose to her.
In recent years, though, Paltrow has been dedicating more time to her lifestyle brand Goop, so she hasn’t been acting as often.
Pepper was subsequently only mentioned in Avengers: Age of Ultron and Captain America: Civil War, with Tony Stark saying in the latter movie that she and him were on a break.