She hailed the experience as the best of her career to date, and treated a select few to another show in London on Monday night (27Jun11).

Beyonce held a party at the city's Shepherds Bush Empire to promote her new album, 4, which included a behind-the-scenes look at the making of the record and a performance for guests including pal Gwyneth Paltrow, Glee stars Kevin McHale and Chris Colfer, and British singer Adele.

Taking to the internet during the event, Gwyneth Paltrow, who has previously cameoed on Glee, posted a picture of her with former castmate Kevin McHale on her WhoSay.com page, alongside the words, "Look who I ran into just now at B's secret show!"