Photos: Kim Kardashian's surrogate spotted with a big baby bump amid speculation that she's expecting twins

Kim Kardashian and Kanye West's surrogate was spotted out and about in Southern California on Tuesday with a bigger baby bump amid speculation that she just might be expecting twins. The married mother-of-two wore a Nike T-shirt over her bump and rolled-up shorts as she was getting into a black sedan car. 

More photos below: