Maybe they bonded over their unusual names! Perez Hilton is reporting that Shia LaBeouf and Rihanna are dating. They're two of the hottest young stars around, with Shia starring in the blockbuster Transformers and Rihanna having the song of the summer with "Umbrella". "It's all the talk of the Indiana Jones 4 set," says one Perez insider on Shia's latest movie set. The new couple was also spotted at Kate Mantilini restaurant in Beverly Hills last night. But what to call them? Shianna? Rihash? They're no TomKat or Brangelina - yet.