Rozonda 'Chilli' Thomas and Tionne 'T-Boz' Watkins -- the two surviving members of R&B trio TLC, are reuniting this summer for their first appearance in four years.

The duo, who lost third member Lisa 'Left Eye' Lopes to a car accident in 2002, are set to play this year's Mixtape Festival in July, held at Hersheypark Stadium in Pennsylvania.

The "Waterfalls" singers have reportedly been working on new material for a comeback album, but no details have been released. They'll play alongside fellow 90s artists 98 Degrees, Hanson and Boyz II Men.

The two singers have also been considering bringing Left Eye back from the dead for a reunion tour -- as a hologram.

After Dr. Dre used the magic of technology to "resurrect" Tupac Shakur for his performance with Snoop Dogg at the 2012 Coachella Music and Arts festival, TLC has been considering doing the same thing with Lopes, to work her into parts of their concerts.

Chilli and T-Boz last took the stage together in Japan in 2009.