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The father of four – including two children with Jackson – was at Las Vegas's Blush Nightclub on Friday helping his ex celebrate, and even giving her a birthday hug.
"We were friends before we were a couple and we're always going to be friends," Jackson told PEOPLE at Wynn Las Vegas before entering the party. "We have two amazing kids together. Kevin is my boy."
She's not kidding. Their reunion came only a few hours after the two hung out together in a VIP cabana at Tao Beach with friends and family.
Jackson, however, insists that there is no talk of rekindling the flame. "We have passed that stage."
Jackson's party was the first stop for Federline in night that saw him dropping by newly opened Lavo, Tao and Prive Las Vegas, where Jackson also joined him.
After seeing each other for the third time in 12 hours, Federline took a break from partying at a table in the club's kitchen, then headed to the deejay booth to publicly wish Jackson a happy birthday into a microphone.
While rumors persist that Federline's other ex, Britney Spears, may be planning a performance at the MTV Video Music Awards next month, she has a backer in Jackson.
"I hope she does it, I hope she goes for it and kills it," Jackson said.
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