A Swift Letdown

■    So that’s where some of those bitter lyrics come from. Three years ago, according to a new story in RadarOnline.com, Taylor Swift lost her virginity to Jake Gyllenhaal, but was left heartbroken when he failed to attend her 21st birthday party. A source tells the website that the country starlet had been “saving herself for marriage” until she fell for Gyllenhaal, then 29. On the day of her party, the actor was nowhere to be found. “Taylor thought maybe he was planning some sort of surprise,” said the source. “Nope. He didn’t show up, and she locked herself in the bathroom and cried the entire night.”