Justin Bieber, Taylor Swift together again

Justin Bieber and Taylor Swift will be performing together again, but we won't tell them to "break a leg."

The traditional good luck phrase took on a oddly prophetic twist when Swift invited Bieber on stage with her around Thanksgiving 2009 at London's Wembley Stadium.

"Only problem is that at Wembley in front of 12,000 people I fractured my foot during ONE TIME and had to finish the song