Perez Hilton — London. Saturday night. The O2 Arena, the same venue where the King of Pop was scheduled to perform a series of 50 concerts. [Video by JPasc.] more info

The Daily Mail — A picture of Jackson was raised on stage while Madonna performed Holiday, then the impersonator came on wearing Jackson's white glove and sequinned jacket. more info

Undercover, Australia — Last night in London (July 4), Madonna adjusted her Sticky and Sweet show for a tribute to Michael Jackson. more info

MTV.com News — Material Girl gives an emotional tribute at the venue were Jackson was scheduled to perform 50 concerts.By Jayson Rodriguez Madonna, Kento and the rest of her dancers perform a tribute to Michael Jackson in London on Saturday Photo: Frank Micel... more info

The Independent — Madonna paid tribute to Michael Jackson as she described him as one of the greatest performers the world has ever known. more info

Star Online, Malaysia — LONDON (AP) - Madonna paid tribute to Michael Jackson on Saturday night in the same arena where he was to stage his comeback, dancing along with an impersonator doing Jackson's distinctive moves. more info

AOL Music — Madonna paid tribute to Michael Jackson during a London concert. more info

BBC News - UK — Madonna starts her revamped Sticky And Sweet tour at London's O2 Arena with a tribute to Michael Jackson. more info

Let's give it up for one of the greatest artists the world has ever known, she said during her concert and the crowd roared its approval. more info

BBC Radio 1 Newsbeat — The singer says Michael Jackson was "one of the greatest artists the world has ever known". more info