Kourtney Kardashian & Mason: Cruisin' In Calabasas

Have stroller, will travel! Kourtney Kardashian's two-year-old son Mason has figured out the easiest way to get around – let mom drive! The pregnant reality star - she and boyfriend Scott Disick are expecting their second child together – and her cool passenger spent a leisurely afternoon running errands in Calabasas, Calif. on Saturday (February 18).

The Kardashians are probably used to being the object of rumors, but there's one circulating that sounds so improbable, it seems too far-out even for the tabloids.

Is Kourtney planning on having a baby for her sister Khloé, who is struggling to get pregnant? According to a report, Khloe and hubby Lamar Odom are fed up with grueling fertility treatments, and the 27-year-old asked her sister to carry her baby - and Kourtney agreed to help out.

“She immediately said yes,” a source said. “Kourtney will do anything to help because she knows just how much Khloé is suffering over her infertility."

Could the rumor be true? It sounds highly unlikely, but with the Kardashians one thing is certain – you never know what to expect.