For the record, I called this months ago when they announced they were going on tour together. 

According to E! Online:

"A witness tells E! News that the night before the 2013 Brit Awards (where Taylor performed in a wedding dress and then stripped down to a skintight black ensemble) Ed arrived at Taylor's hotel and went straight to her room. From there, the twosome "stayed in the room, just the two of them, until around 4 a.m.," according to a source.

When Ed left the hotel, a witness saw him looking "very happy." From there, he got into the car that Taylor had used earlier in the day and was driven away. "He looked very pleased with himself," adds the witness.

Another source tells E! News that Taylor and Ed 'briefly dated last spring. He thinks she is really cute and they have a great chemistry together.'"

Let's recap:

Taylor and Eddddd sitting in a tree. K-I-S-S-I-N-G.

But wait... isn't he like super close with Harry????