"Very excited to see little Lullah today who is now walking!" Tweeted the Made in Chelsea star before uploading a cute photo of the pair together.
"Can't keep up," wrote Millie next to the picture of an excited Lullah, who was walking a step ahead of the 23-year-old newlywed.
Millie was dressed for the Autumnal weather in boots, jeans and a warm fur jacket, similar to that which her mini companion was wearing.
The makeup artist accessorised her look with a wide brimmed hat and deep red nail polish.
Last month the stylish reality TV star denied rumours that she was pregnant.
"Pregnancy rumours are just that," wrote Millie just days after she returned from her honeymoon with her new husband Professor Green. "We are far too busy enjoying each other right now".