They once dated, they recorded a song together and they didn't like each other for the longest time, but it looks like they have buried the hatchet.

Madonna was a special guest at Prince's January 18 "Welcome 2 America" concert at Madison Square Garden. The "Like A Virgin" singer hardly went unnoticed.

According to Us magazine, the Purple One acknowledged Madonna during his show, making a joke about the cost of her concert tickets. "I know I'm expensive," he said.

In 2007 things weren't so peachy between the two. Prince dismissed Madge during a London gig, saying that he had more "hits than Madonna's got kids."

via Jan. 17-23: Madonna And Prince, Friends Again? - That's Really Week.