Payne, 19, was in a relationship with Peazer for two years but ended their romance in September as they were unable to give time to each other.
However, they sparked rumours of a patch-up when Peazer flew down here so she could attend Payne's performance with his band One Direction, reported Huffington Post.
"Most of the trouble was down to not being able to spend enough time together. They really miss each other," a source said.
"Danielle had already planned to go to New York for the concert before they split and Liam didn't want her to pull out," the source added.
Peazer was seen arriving with One Direction member Louis Tomlinson's girlfriend Eleanor Calder.