AceShowbiz -

Kevin Federline and ex-girlfriend Shar Jackson reunited for one more time when she celebrated her 32nd birthday Friday night, August 22. He surprised her, showing up at the party and giving her kiss and hug, only to spark rumors that they have rekindled their romance.

Shar was celebrating her 32nd birthday inside the VIP room of Blush Boutique nightclub at the Wynn in Las Vegas when K-Fed showed up, much to her surprise. "A crowd came to see what all the commotion was and they found Shar and Kevin sharing some public affection," an eyewitness testified. "Kevin showed up to wish her a happy birthday. They shared a very public embrace and kiss before Kevin left."

Pouring cold water to speculation of a rekindled romance, Shar insisted she and K-Fed have "passed the stage". She went on telling People, "We were friends before we were a couple and we're always going to be friends. We have two amazing kids together. Kevin is my boy."

In the afternoon, prior to the birthday bash, both K-Fed and Shar were also seen hanging together at Tao Beach, Prive and the newly opened Lavo.

K-Fed was still dating Shar when he began seeing Britney Spears. They are parents to two children; daughter, Kori Madison Federline and son Kaleb Michael Jackson Federline. They remain good friends despite the fact that he reportedly cheated on her with Spears while she was pregnant.