Mary J. Blige** and Jeff Beck **will appear as special guests at the Rolling Stones concert in London tonight, the band announced on their website. The R&B singer and rock guitar legend will be taking the stage with the band as they kick off their 50th anniversary tour at the 02 Arena.

Former Rolling Stones bassist Bill Wyman and guitarist Mick Taylor will also be on hand for the two London shows on the 50 and Counting tour, marking their first appearance with the band in more than 20 years.

There will be no supporting acts for the concerts, and the band plans to perform for more than two hours. After the two shows in London this week, the Rolling Stones will be heading off to the U.S. for a show at Brooklyn's Barclays Center and two shows at the Prudential Center in Newark, New Jersey.