London, July 5 (ANI): A biography by Queen of Pop Madonna's brother Christopher Ciconne has revealed that the singer once grabbed actress Gwyneth Paltrow and gave her a steamy kiss on the lips at a showbiz party.

The 49-year-old singer has been always under scrutiny for her lesbian flings and the new revelations by her younger brother have sparked off another controversy.

In his book 'Life With My Sister Madonna', Christopher revealed that the 'Like A Virgin' singer was dancing on a table at 4am when she dragged Gwyneth up to join her and the pair started dancing together.

The Material girl then grabbed Paltrow, pulled her and kissed the Hollywood star full on the mouth.

"The book is a warts-and-all account. Chris was there for all the key moments in Madonna's life. There is no-one better placed to tell the real story behind Madonna's public image," The Sun quoted a source, as saying.

However, the singer's spokeswoman said: "Madonna has not co-operated with any biography about herself." The book will also spill beans on the sordid secrets of Madonna's past and her marriage to hubby Guy Ritchie when it is out later this month. (ANI)