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Sebastian Stan still has plenty of XOXO’s for this Gossip Girl alum.

While reflecting on the show’s 19th anniversary, the 42-year-old detailed which of the show’s original cast—which included Blake Lively, Leighton Meester, Penn Badgley, Chase Crawford and more—he still keeps in touch with.

“I talk to Chase a lot,” Sebastian told E! News’ Will Marfuggi in an exclusive interview at the Thunderbolts Los Angeles premiere April 28. “I knew him before Gossip Girl so we stayed close. Penn Badgley, I did his podcast at one point—but really Chase.”

And as Sebastian reprises his role of Bucky Barnes for Marvel’s Thunderbolts, which hits theaters May 2, he admitted that his superhero could hold his own against Chase’s The Boys character, The Deep—but he wouldn’t want to put his theory to the test.

“We could also just laugh it out,” he joked. “He’s just brilliant.” (For more from Sebastian and the Thunderbolts cast, tune into E! News tonight, April 29, at 11 p.m.)

All jokes aside, the Marvel star was committed to doing as many stunts as he could for the new movie, which also stars Florence Pugh and David Harbour, which proved to be a difficult undertaking.

“We just don’t have as much time as we used to in preparing,” he admitted. “It’s a little bit like, ‘hurry up and learn it and let’s do it.’”

And The Apprentice star noted that he is starting to feel the toll of getting older.

“That’s really tough,” he continued. “And mentally you’re still like ‘I can do it.’” Still, Sebastian wouldn’t change a thing about how he prepared for the film.

“It’s nice to have a challenge,” he added. “It’s nice to kind of be able to keep coming back to it. The fear and the adrenaline and the excitement kind of blend in together and by the end it’s all fun.”

As he put it, “As long as I can get in there a little bit, I’m grateful.”