Robert Pattinson and Kristen Stewart were side by side yesterday afternoon as they touched down at LAX. The pair was coming from Chicago, where they joined Dakota Fanning and Taylor Lautner to film their special episode of Oprah that's set to air on May 13, which is actually Rob's 24th birthday! Oprah apparently dared to ask Robert and Kristen about their romantic status, and he joked that Kristen's actually pregnant — Kristen, though, played it off by saying Rob's the one who'd carry their child. He also made surprise stops at fans' homes in Illinois, which were taped for the program. Kristen reunited with Robert after a few days in NYC, where she hit the red carpet on Monday wearing a controversial Chanel number for the Costume Institute Gala. Rob wasn't with her for the big fashionable night, but we'll see lots of them together and apart — like her hot Elle cover — in the run-up to Eclipse's June release.