Nicole Richie Khloe Kardashian sunglasses tights work out gym

Not that these two are new BFFs... after all, Khloe Kardashian (along with mom Kris Jenner) attended Nicole Richie's wedding to Joel Madden!

Check out the two reality TV starlets - one former, one current - hitting up the gym together in Studio City this morning for a workout session.

Our X17 photog questioned Khloe about possibly being preggers with Lamar Odom's baby, but the Kardashian sibling kept quiet. Watch the vid below!