Singers Jessica Simpson and John Mayer have once again been seen together in New York, though they still deny being a couple.

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This time they were seen at the jewelry counter at Barneys on Madison Avenue, where it looked like Mayer was buying Simpson a gift, The New York Post reported.

The two were giggling and dancing in front of the glass display case, and Mayer was also holding Simpson's hands in his own, the Post said.

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"They looked very happy together," said one of the onlookers. "They were having fun and joking around."

This is the third time in recent weeks that the duo has been seen together, the Post said.