Alex Cooper and Matt Kaplan put on a united front on the 2026 YouTube Upfront red carpet after reportedly dealing with marital “tension.” The “Call Her Daddy” host and the film producer appeared in good spirits while posing for photographers at the New York City-based event Wednesday. Kaplan, who sported a black sweater and pants, beamed as he placed his hand around his wife’s waist. Alex Cooper and Matt Kaplan attended the 2026 YouTube Upfront red carpet in New York City Wednesday (as seen above). Evan Agostini/Invision/AP They were seen holding hands while making their way to the event (seen here). Santi Ramales / BACKGRID As for Cooper, 31, she wore a black blazer and black pants. The couple were also seen holding hands while walking up to the event. Ahead of the star-studded event, the streaming platform announced a slate of new shows featuring Cooper and produced by her production company, Unwell Productions.…