Taylor Swift‘s concert is a family affair … ’cause apparently her opener Suki Waterhouse‘s baby daddy Robert Pattinson‘s in the crowd — and Paramore made a Twilight reference to highlight him!

The rock band took the stage at Wembley Stadium in London not long ago … and, before their song “Decode” they shouted out the actor, dedicating the track to him.

Check out the video … Hayley Williams calls him “Mr. Waterhouse” — a cheeky nickname for the star — before adding he has a killer’s skin, a oft-quoted line from “Twilight.”

While they didn’t show RP on the big screen, we know why he’s there … to support Waterhouse, who opened the show — driving 90k fans wild at England’s largest venue.

People online are going crazy over her performance BTW … highlighting just how far she’s come over the last decade, from very intimate venues to sold-out stadiums.

She and Robert were first linked back in 2018 … and, they welcomed their first child earlier this year — revealing at Coachella they had a girl.

The relatively private couple haven’t talked much more about their kiddo … but, clearly they’re still together  — and, SW’s musical pals are supportive.

It’s Taylor’s third of five nights at Wembley … and, it’s been a crazy set of shows with everyone from Malala to Sharon Osbourne showing up for the pop star.