The report says that on the eve of the concert, Kate left her London apartment and arrived at Clarence House, Prince William's London home, around midnight.

The couple split up in April after a four year relationship filled with speculation of wedding bells.

Prince William gave the boldest indication that he's back together with his old flame when he invited her and her family to sit in the royal box at Wembley stadium for the concert celebrating his mother's life.

The two still managed to keep everyone guessing by not sitting together.

One loosed-lipped royal source told the paper, "They are of course close friends and have remained so since April.

But they both want space and do not want to conduct their friendship with the added attention and pressure of more speculation.

They particularly did not want their friendship to be the focus of media attention. Yesterday was about Diana and celebrating her life and work."

The Daily Mail also reports a list of bosh-tastic blind and not-so-blind items that emerged from the Princess Diana concert…

"P Diddy's suggestions to rap music-loving David Beckham that they should go clubbing in London after the concert was met by killer glares from his wife Victoria.

• Which stroppy pop veteran threw a hissy fit when he found there was no TV in his room backstage? He then ordered a flunky to dash to Curry's to buy a plasma screen - cost £500.

• Lily Allen was told that if she continued to smoke backstage she'd have to leave. She decided to go home at 6pm, four hours before the afterparty began."