Bey and Jay 'planning joint tour

The 'XO' singer and her 'Holy Grail' rapper husband are said to be getting ready to announce that they will be doing a joint tour of the United States after making a number of surprise appearances at each other's gigs, according to the New York Post newspaper's Page Six.

The couple - who recently wrapped on their own individual tours, with Jay performing 52 dates in support of his 'Magna Carta...Holy Grail' album and Beyoncé concluding her 'Mrs. Carter Show' world tour last month - are expected to play at 20 stadiums across the US this summer with a New York date of July 4.

Beyoncé, 32, and Jay Z, 44, have performed their hit single 'Drunk in Love' at a number of high-profile events including the Grammy Awards, a Super Bowl party and one of Beyoncé's O2 Arena gigs in London, in recent months.

The hip-hop pairing - who have 2-year-old daughter Blue Ivy together - also took to the stage individually at the Coachella Valley Music and Arts Festival in California at the weekend with Beyoncé joining her sister Solange for a surprise rendition of 'Losing You' while Jay performed alongside fellow rappers Nas and Diddy.