TAYLOR SWIFT

And she didn't even need an elaborate backstory! While dating Conor Kennedy, the country crooner found herself sharing a hobby with Wedding Crashers Owen Wilson and Vince Vaughn after attending the wedding of a Kennedy relative unannounced. Though Swift's rep denied her appearance was unexpected, Today show host Kathie Lee Gifford backed up the family's claims, saying, "I'm not sure [Taylor] didn't know she wasn't invited."

WENN