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The Stranger Things star is stepdad to wife Lily Allen's daughters, Ethel and Marnie.
The couple attended one of Swift's shows at SoFi Stadium in Inglewood, Calif.
"I was absolutely blown away watching her art bring so many people together," the actor wrote.
"No one will understand what this album means to me," one fan wrote.
The sister duo previously attended one of Taylor Swift's shows in Texas.
"I'm going to spend several decades trying to figure out words for how that just made me feel," she gushed.
On the new Pop Shop Podcast, Katie & Keith talk about heading to LA's SoFi Stadium to see the Eras Tour after taking a field trip to Las Vegas' Allegiant Stadium back in March.
Monday's surprise songs included an acoustic debut & a solo debut, with a particularly poignant "Exile" sing-along.
The pop star wrote 8-year-old Genesis a sweet note and took pictures with him after the show.