Janet Jackson was left stunned when her boyfriend Jermaine Dupri vomited in her lap at his birthday party.

The "Feedback" singer had been helping her beau celebrate turning 36 at New York nightclub Tenjune, where they drank Patron tequila and Jay-Z's Ace of Spades Champagne with pals including Ne-Yo, Busta Rhymes and Ice-T.

However, the large quantities of alcohol are said to have proved too much for Jermaine.

A source told the New York Post newspaper: "Jermaine was doing really well, but then he looked a bit funny. He leaned over and vomited in Janet's lap. Janet squealed before bolting out of the scene and speeding off in her chauffeured Maybach car."

Jermaine recently revealed the secret behind his successful relationship with 42-year-old Janet.

He explained: "The greatest thing in life is just to have a friend. When I have problems in life, I share them with her. When she has a problem, she comes to me."

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