Liam Payne has been a hot topic on social media since he debuted his new look.
"Seeing the world through your eyes last night was the most beautiful thing to experience. My neck hurts from how much I'm looking up to you right now you were already my friend and brother but getting to look through that window into your world and mind I just extend that respect I have for you," he posted a photo of him and Louis smiling and standing closely together at the event.
The Strip That Down singer concluded his post by inviting his followers to watch the documentary.
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Netizens, however, got easily distracted by Liam's distinctly different appearance during the event.
Reactions to photos of him at the affair ranged from cosmetic surgery allegations to comparisons with movie characters.
One Twitter user tagged popular YouTuber and cosmetic plastic surgery industry critic Tyler Oakley, who simply responded "do not drag me into all of this" with a laugh.
"Did he really do anything though? He lost weight and aged. Look at some pics of Harry. At one point he had a little weight on him and he had a sweet round baby face too. He's much slimmer and chiseled now too and you can tell he hasn’t had surgery," another commented.
His fans, meanwhile, defended him by saying that Liam has their support regardless if he had surgery or not.
Plastic surgeons told entertaiment news portal Page Six that Liam's appearance certainly changed.
"He didn’t look bad before, but his face, instead of looking soft and a little bit chubby, it looks model-ish and rugged," celebrity plastic surgeon Dr. Ramtin Kassir said.
Plump Cosmetics founding injector Pamela Weinberger said the singer might have gotten regular maintenance botox on top of fillers for his jawline, lip, and chin.
Liam has remained friends with his One Direction bandmates even after their split in 2015. The group, which produced hits like What Makes You Beautiful and Night Changes, consisted of him, Tomlinson, Harry Styles, Zayn Malik, and Niall Horan. They have since pursued solo careers.