Paris Hilton and Nicole Richie are ready to kiss and make up. The two are secretly planning to reunite during a September appearance on Late Night With David Letterman, The ENQUIRER has learned.

Estranged for more than a year, Paris and Nicole have separately hashed out agreements with Late Night producers to let Dave serve as the peacemaker in their ongoing feud. Producers hope the stunt will help attract hip, younger viewers to the 59-year-old Letterman's show.

Read all about it in this week's issue of The ENQUIRER.