The 20th anniversary of the Scottish festival will also see sets from Alt-J , Jake Bugg, Paloma Faith and Of Monsters and Men.
Of their inclusion on the bill for the event – which takes place July 12-14, 2013 in Balado near Kinross – Alt-J said: “It’s an absolute honour to be invited back to play at Scotland’s biggest and best music festival – we can’t wait!”
Tickets for the festival go on sale at 9am (GMT) Friday December 7. A limited number of tickets will be on sale at 2012 prices.
Speaking about next year’s headliners, festival director Geoff Ellis said: “Seems like only yesterday that the first band took to the stage at Strathclyde Park for our inaugural T in the Park in 94, now here we are in 2012 announcing two of the of the world’s biggest and best acts to headline our 20th edition.”
He added: “We have always worked incredibly hard to bring our T in the Park fans the best line-up possible, and this year is no exception. We are unbelievably excited that Rihanna and Mumford & Sons will be taking to the Main Stage in Kinross as we are sure our audience will be. We have many more fantastic acts in store for everyone and will announce these next year, but it’s shaping up to be one hell of celebration.”