On Monday, ET caught up with the cute couple at the Los Angeles premiere of Channing's new film The Hateful Eight, just days after Jenna celebrated her special day.
"We had a nice fun adventure on my birthday," Jenna shared. "We rode motorcycle up and down the coast. That was really fun. Scary and fun. And it was a nice surprise. [Channing's] always really good at surprises."
But the handsome Magic Mike heartthrob isn't the only one who knows a thing or two about surprises. Jenna revealed that she often gets red-carpet ready all alone, so Channing doesn't see the finished look until they are on their way out the door.
"It takes too long for her to get ready. I just could chill out downstairs and she comes out looking like that," Channing, 35, joked.
"Aww thanks," Jenna said, smiling. "I am pretty much see-through in this dress."
"I don't think you're see-through," Channing assured her. "You look fine. I checked you out."
Jenna wasn't the only one Channing gushed over. The 22 Jump Street star also opened up about his excitement for getting the opportunity to work with filmmaker Quentin Tarantino, who directed The Hateful Eight.
"I vied for this part like no other!" Channing recounted. "I was like, 'Look, lock me in the room with any other actor and if they can came out they can have the job.' I was like, 'I'll do craft services on this film.'"
When it finally came down to shooting the epic Western, Channing said it was Tarantino himself who kept the cast entertained and happy.
"He's like the energizer bunny. He doesn't stop. He's like a big kid on the set," Channing revealed.
According to Channing, it was Tarantino's "no-cell-phones-allowed" policy that really made the shoot memorable.
"I think if I ever direct a film, I'm gonna do that as well," he said. "It makes people actually talk to each other and talk about what you're doing. You actually don't just sit there and go to all the news, see all the terrible stuff that's happening in the world. You actually stay in it. It's nice."
Channing co-stars alongside Samuel L. Jackson, Kurt Russell, Tim Roth, Jennifer Jason Leigh and Michael Madsen in The Hateful Eight -- which comes out in limited release on Christmas Day, and opens into theaters everywhere Jan. 8.