The "Poison" hitmaker is apparently desperate for Formula One racing driver Lewis Hamilton to come "running back" to her, reported Femalefirst.
"Nicole was determined to go wild for her birthday and spent most of the day drinking cocktails and champagne, even though her pals warned her to slow down.
"But she received a birthday message from Lewis at the end of the night, as well as an Instagram post, which made her feel incredibly emotional. Deep down she still loves him and had been hoping that he'd come running back and finally commit," a source said.