The billionaire pop superstar and the three-time NFL Super Bowl champion, both 36, have kept fans guessing, but details are beginning to emerge as the clock counts down to their big day.US media report that the A-list festivities will kick off Thursday evening with an exclusive dinner -- only around 100 people are invited -- at the storied sports arena. The wedding itself will reportedly take place Friday with a star-studded guest list of around 1,000, including models Gigi Hadid and Cara Delevingne, singer Selena Gomez, and actress Zoe Kravitz -- all known to be close Swift pals -- and Kelce's Kansas City Chiefs teammates.Rumor has it that Stevie Nicks and Tim McGraw, both close to Swift, will perform. British artists Ed Sheeran -- another Swift pal -- and Paul McCartney may also go on stage.Guests are said to have signed confidentiality agreements and will be without their phones for the ceremony, expected to begin in the mid-afternoon with cocktails before a reception going into the night. Celebrity outlet TMZ said that the lavish decor will include a replica castle built inside Madison Square Garden. Rumor mill

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Those who scored a coveted invitation to the highly-anticipated event also received nondisclosure agreements, a source who is on the guest list said.