Taylor Swift and Travis Kelce’s August 2025 engagement and reported summer 2026 wedding plans in Rhode Island anchor trader confidence in one key condition, pushing the Yes side to a 55.5% implied probability. Tom Holland and Zendaya, engaged since late 2024, face scheduling hurdles from Zendaya’s packed film slate that could delay their marriage. Timothée Chalamet and Kylie Jenner, dating since 2023, show the weakest momentum, with engagement odds in related markets remaining below 25%. Traders view the requirement that all three milestones occur before year-end as the central risk, tempered by the near-certainty of at least one wedding. Key catalysts ahead include any official Swift-Kelce wedding date confirmation and updates on Zendaya’s production timeline.