The pair had been dating but felt out and Fred is rumoured to have written a bitter song about Britney entitled Drop Dead. He also enraged Britney by speaking out about their relationship on Limp Bizkit's website.
The pair met in Hugo's restaurant in Hollywood and according to onlookers it was an excruciating moment for Fred.
An onlooker says, "It was a true Hollywood moment. Britney was drinking tea when she spotted Fred walk in. She was uncomfortable and at first it showed."
When Fred waved Britney refused to react.
The source says, "She put her head down and concentrated on her food. "
Fred persisted and went over to Britney's table - at which point Britney got up and went to the toilet.
The onlooker adds, " Britney had the last laugh. She humiliated Fred in public."
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