Tom Cruise greeted fans outside the Four Seasons Hotel in London during filming for Mission: Impossible 7.
The star was filming and came outside to wave to fans, wearing a black face mask, on Monday (26).
Marysia Horner, 48, was staying at a hotel opposite with her daughter, and said the film crew had been shooting since she arrived on Sunday.
"We thought they were filming a BMW commercial or something!" she said.
"We stood outside like little groupies waiting".