With both of Britney Spears' exes in Los Angeles last weekend for the Grammys, it was only a matter of time before the two had a close encounter -- which was caught by photographers on the red carpet at the Rolling Stone pre-Grammys party Feb. 9 at L.A. club Avalon.
Witnesses say Federline, 28, appeared caught off-guard when his ex boss, Timberlake, 26, came up behind him and gave him a happy greeting.
"Justin walked right up and they man-hugged," say an eyewitness. "It was clear that they really like each other."
But do they really? Us magazine brought in an expert to analyze the exchange.
According to to body language expert Lillian Glass, the hug was a "sympathetic gesture," and indicates "they're like comrades."Source: usmagazine.com