Still, when the actor popped up on stage to introduce Sia's "Chandelier" performance at the Grammys Sunday, things got a little awkward when he pulled out a letter to the singer and appeared to be professing his love for her.
"For Sia: I feel like this may be strange to say this here," he said. "I love you so. Punch me if I stop crying. I raised a white flag for you, defeated finally. If strength were made of broken pieces, you and I would always win. It is, though, and building and statues wink at us. I could squeeze you to zero. I'll never know another. What am I going to do? Punch me if I stop crying, and I'll do the same. Love, Erik."
As it turns out, the letter was actually written by the singer's husband Erik Anders Long, according to Us Weekly. "What Shia read to introduce Sia wasn't actually a poem," the source told the mag. "It was a love letter from Sia's husband!"
Shia, who starred in Sia's "Elastic Heart" video, reportedly worked with Erik to make the surprise happen. "Erik and Shia conspired together and did this as a gift to Sia," the source continued. "She was COMPLETELY surprised and had no idea."
Following Shia's reading, Sia went on to perform with her face turned to a wall, as Kristen Wiig and dancer Maddie Ziegler put on a show with an interpretive dance to "Chandelier."
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Gallery | 2015 Grammys: After Party Pics