The 'Simple Life' star is promoting Swedish inventor Lennart Jarlerbro's dog urinals which are tied to street lights, preventing them from being eroded by the animals' urine.
Nicole - who is expecting her first child in January - said: "This invention is just so clever. It's a cute rubber cup attached to the post and a hose that pipes urine into the gutter."
Jarlerbro, who revealed his designs earlier this month, came up with the idea after getting annoyed at seeing lampposts prematurely corroded.
He said: "The average lamppost has a lifespan of 30 years but my invention could add a further 15 years."